Giraffe | Understanding and definition of the Giraffe | New Photos of Giraffe

The giraffe (Giraffa camelopardalis) is an African even-toed ungulate mammal, the tallest of all extant land-living animal species, and the largest ruminant. Its scientific name, which is similar to its archaic English name of camelopard, refers to its irregular patches of color on a light background, which bear a token resemblance to a leopard's spots, and its face, which is similar to that of a camel. The average mass for an adult male giraffe is 1,200 kilograms (2,600 lb) while the average mass for an adult female is 830 kilograms (1,800 lb). It is approximately 4.3 metres (14 ft) to 5.2 metres (17 ft) tall, although the tallest male recorded stood almost 6 metres (20 ft).

The giraffe is related to other even-toed ungulates, such as deer and cattle, but is placed in a separate family, the Giraffidae, consisting of only the giraffe and its closest relative, the okapi, and their extinct relatives. Its range extends from Chad in Central Africa to South Africa. Giraffes usually inhabit savannas, grasslands, or open woodlands. However, when food is scarce they will venture into areas with denser vegetation. They prefer areas with plenty of acacia growth. They will drink large quantities of water when available, which enables them to live for extended periods in arid areas. The giraffe's fur may serve as a chemical defence, and is full of antibiotics and parasite repellents that gives the animal a characteristic scent. Old males are sometimes nicknamed "stink bulls". There are at least eleven main aromatic chemicals in the fur, although indole and 3-methylindole are responsible for most of their smell. Because the males have a stronger odour than the females, it is also suspected that it has a sexual function. The giraffe has one of the shortest sleep requirements of any mammal, which averages 4.6 hours per 24 hours.

The name giraffe has its earliest known origins in the Arabic word الزرافة ziraafa or zurapha, perhaps from an African name. It appears in English from the 16th century on, often in the Italianate form giraffa. The species name camelopardalis (camelopard) is derived from its early Roman name, where it was described as having characteristics of both a camel and a leopard. The English word camelopard first appeared in the 14th century and survived in common usage well into the 19th century. The Afrikaans language retained it.

The giraffe is one of only two living species of the family Giraffidae, along with the okapi. The family was once much more extensive, with over 10 fossil genera described. The giraffids evolved from a 3 m (9.8 ft) tall antelope-like mammal that roamed Europe and Asia some 30–50 million years ago. The earliest known giraffid was Climacoceras, which still resembled deer, having large antler-like ossicones. It first appeared in the early Miocene epoch. Later examples include the genera Palaeotragus and Samotherium, which appeared in the early-to-mid-Miocene. They were both tall at the shoulder, and had developed the simple, unbranched ossicones of modern giraffids, but still had relatively short necks. From the late Pliocene onwards, the variety of giraffids drastically declined, until only the two surviving species remained. The modern genus Giraffa evolved during the Pliocene epoch, and included a number of other long-necked species, such as Giraffa jumae, that do not survive today.

The giraffe was one of the many species first described by Linnaeus in 1758. He gave it the binomial name of Cervus camelopardalis in the 10th edition of his Systema Naturae. Brisson erected the genus Giraffa in 1762.

Different authorities recognize different numbers of subspecies, differentiated by size, colour and pattern variations and range. Some of these subspecies may prove to be separate species as they appear to be reproductively isolated despite their mobility. The subspecies recognized by most recent authorities are:

• G. c. camelopardalis, the nominate subspecies, is known as the Nubian Giraffe. Its coat pattern has large, four-sided spots of chestnut brown on an off-white background and no spots on inner sides of the legs or below the hocks. It is found in eastern Sudan and northeastern DR Congo. It has been estimated that fewer than 250 remain in the wild, but little is known about this subspecies and consequently this estimate is labelled with great uncertainty. It is very rare in captivity, although kept at Al Ain Zoo in the United Arab Emirates.
• G. c. reticulata, known as the Reticulated or Somali Giraffe, has a coat pattern of well defined patches that are normally a bright orange-brown colour. These patches have sharp edges and are separated by bold, bright white lines. It ranges from northeastern Kenya, into southern Ethiopia and Somalia. It has been estimated that fewer than 5.000 remain in the wild, and based on ISIS records it is among the most common in zoos, with more than 450 kept.
• G. c. angolensis, the Angolan or Smoky Giraffe, has large spots with some notches around the edges, extending down the entire lower leg. It is found in southern Angola, northern Namibia, southwestern Zambia, Botswana and western Zimbabwe. It has been estimated that fewer than 20,000 remain in the wild, and based on ISIS records approximately 20 are kept in zoos.
• G. c. antiquorum, the Kordofan Giraffe, has smaller, more irregular spots that cover the inner legs. Its distribution includes southern Chad, Central African Republic and northern Cameroon. Populations in Cameroon were formerly included in G. c. peralta instead, but this was incorrect. Fewer than 3,000 are believed to remain in the wild. Considerable confusion has existed over the status of this subspecies and G. c. peralta in zoos. In 2007 it was shown that all "G. c. peralta" in European zoos actually are G. c. antiquorum. Consequently, approximately 65 are kept in zoos based on ISIS records.
• G. c. tippelskirchi, known as the Maasai Giraffe or Kilimanjaro Giraffe, has jagged-edged, vine-leaf shaped spots of dark brown on a brownish-cream background. It is the darkest coloured subspecies. It occurs in central and southern Kenya and Tanzania. It is estimated that fewer than 40,000 remain in the wild, and based on ISIS records approximately 100 are kept in zoos.
• G. c. rothschildi, is known variously as the Rothschild Giraffe or Baringo Giraffe or Ugandan Giraffe. Its coats bears deep brown, blotched or rectangular spots with poorly defined cream lines. Its legs are mostly white with no pattern. Its range includes Uganda and west-central Kenya, especially near Lake Baringo. It may also occur in southern Sudan. Fewer than 700 are believed to remain in the wild, and based on ISIS records more than 450 are kept in zoos.
• G. c. giraffa, the South African Giraffe, has rounded or blotched spots, some with star-like extensions on a light tan background, running down to the hooves. It is found in northern South Africa, southern Botswana, southern Zimbabwe and southwestern Mozambique. It is estimated that fewer than 12,000 remain in the wild, and based on ISIS records approximately 45 are kept in zoos.
• G. c. thornicrofti, called the Thornicroft Giraffe or Rhodesian Giraffe, has star-shaped or leafy spots extend to the lower leg. It is restricted to the Luangwa Valley in eastern Zambia. Fewer than 1,500 remain in the wild, and based on ISIS records none are kept in zoos.
• G. c. peralta, commonly known as the West African Giraffe or Nigerian Giraffe, has numerous pale, yellowish red spots. It is endemic to southern Niger. With fewer than 220 individuals remaining in the wild, it is the rarest giraffe subspecies. Giraffes in Cameroon were formerly believed to be this subspecies, but are actually G. c. antiquorum. This has also resulted in some confusion over its status in zoos, but in 2007 it was established that all "G. c. peralta" kept in European zoos actually are G. c. antiquorum.

Formerly, the Kordofan and West African Giraffes were regarded as a single subspecies, but genetic evidence has confirmed that they represent two separate subspecies. Comparably, the Rothschild's Giraffe has been considered a hybrid population, but genetic evidence has confirmed that it is a valid subspecies. By contrast, scientists have proposed four other subspecies — Cape Giraffe (G. c. capensis), Lado Giraffe (G. c. cottoni), Congo Giraffe (G. c. congoensis), and Transvaal Giraffe (G. c. wardi) — but today none of these is widely accepted. One genetic study on Smoky Giraffes suggests that the northern Namib Desert and Etosha National Park populations are distinct subspecies.

Rabies | Understanding and definition of Rabies | Symptoms caused by Rabies | The risk is borne by Rabies

Rabies is a viral disease that causes acute encephalitis (inflammation of the brain) in warm-blooded animals. It is zoonotic (i.e., transmitted by animals), most commonly by a bite from an infected animal. For a human rabies is almost invariably fatal if post-exposure prophylaxis is not administered prior to the onset of severe symptoms. The rabies virus infects the central nervous system, ultimately causing disease in the brain and death. The early symptoms of rabies in people are similar to that of many other illnesses, including fever, headache, and general weakness or discomfort. As the disease progresses, more specific symptoms appear and may include insomnia, anxiety, confusion, slight or partial paralysis, excitation, hallucinations, agitation, hypersalivation (increase in saliva), difficulty swallowing, and hydrophobia (fear of water). Death usually occurs within days of the onset of these symptoms.

The rabies virus travels to the brain by following the peripheral nerves. The incubation period of the disease is usually a few months in humans, depending on the distance the virus must travel to reach the central nervous system. Once the rabies virus reaches the central nervous system and symptoms begin to show, the infection is effectively untreatable and usually fatal within days.

Early-stage symptoms of rabies are malaise, headache and fever, progressing to acute pain, violent movements, uncontrolled excitement, depression, and hydrophobia. Finally, the patient may experience periods of mania and lethargy, eventually leading to coma. The primary cause of death is usually respiratory insufficiency. Worldwide, roughly 97% of rabies cases come from dog bites. In the United States, however, animal control and vaccination programs have effectively eliminated domestic dogs as reservoirs of rabies. In several countries, including the United Kingdom, Estonia and Japan, rabies carried by animals that live on the ground has been eradicated entirely. Concerns exist about airborne and mixed-habitat animals including bats. A small number of bats of three species in the U.K and in some other countries have been found to have European Bat Lyssavirus 1 and European Bat Lyssavirus 2. The symptoms of these viruses are similar to those of rabies and so the viruses are both known as bat rabies. An unvaccinated Scottish bat handler died from an EBLV infection in 2002.

The economic impact is also substantial, as rabies is a significant cause of death of livestock in some countries.

The period between infection and the first flu-like symptoms is normally two to twelve weeks, but can be as long as two years. Soon after, the symptoms expand to slight or partial paralysis, cerebral dysfunction, anxiety, insomnia, confusion, agitation, abnormal behavior, paranoia, terror, hallucinations, progressing to delirium. The production of large quantities of saliva and tears coupled with an inability to speak or swallow are typical during the later stages of the disease; this can result in hydrophobia, in which the patient has difficulty swallowing because the throat and jaw become slowly paralyzed, shows panic when presented with liquids to drink, and cannot quench his or her thirst.

Death almost invariably results two to ten days after first symptoms. In 2005, the first patient was treated with the Milwaukee protocol, and Jeanna Giese became the first person ever recorded to survive rabies without receiving successful post-exposure prophylaxis. An intention to treat analysis has since found that this protocol has a survival rate of about 8%.

The rabies virus is the type species of the Lyssavirus genus, in the family Rhabdoviridae, order Mononegavirales. Lyssaviruses have helical symmetry, with a length of about 180 nm and a cross-sectional diameter of about 75 nm. These viruses are enveloped and have a single stranded RNA genome with negative-sense. The genetic information is packaged as a ribonucleoprotein complex in which RNA is tightly bound by the viral nucleoprotein. The RNA genome of the virus encodes five genes whose order is highly conserved: nucleoprotein (N), phosphoprotein (P), matrix protein (M), glycoprotein (G) and the viral RNA polymerase (L).

From the point of entry, the virus is neurotropic, traveling quickly along the neural pathways into the central nervous system (CNS), and then further into other organs. The salivary glands receive high concentrations of the virus thus allowing further transmission.

The reference method for diagnosing rabies is by performing PCR or viral culture on brain samples taken after death. The diagnosis can also be reliably made from skin samples taken before death. It is also possible to make the diagnosis from saliva, urine and cerebrospinal fluid samples, but this is not as sensitive. Inclusion bodies called Negri bodies are 100% diagnostic for rabies infection, but are found in only about 80% of cases. If possible, the animal from which the bite was received should also be examined for rabies.

The differential diagnosis in a case of suspected human rabies may initially include any cause of encephalitis, particularly infection with viruses such as herpesviruses, enteroviruses, and arboviruses (e.g., West Nile virus). The most important viruses to rule out are herpes simplex virus type 1, varicella-zoster virus, and (less commonly) enteroviruses, including coxsackieviruses, echoviruses, polioviruses, and human enteroviruses 68 to 71. In addition, consideration should be given to the local epidemiology of encephalitis caused by arboviruses belonging to several taxonomic groups, including eastern and western equine encephalitis viruses, St. Louis encephalitis virus, Powassan virus, the California encephalitis virus serogroup, and La Crosse virus.

New causes of viral encephalitis are also possible, as was evidenced by the recent outbreak in Malaysia of some 300 cases of encephalitis (mortality rate, 40%) caused by Nipah virus, a newly recognized paramyxovirus. Similarly, well-known viruses may be introduced into new locations, as is illustrated by the recent outbreak of encephalitis due to West Nile virus in the eastern United States. Epidemiologic factors (e.g., season, geographic location, and the patient’s age, travel history, and possible exposure to animal bites, rodents, and ticks) may help direct the diagnostic workup.

Cheaper rabies diagnosis will be possible for low-income settings: accurate rabies diagnosis can be done at a tenth of the cost of traditional testing using basic light microscopy techniques.

All human cases of rabies were fatal until a vaccine was developed in 1885 by Louis Pasteur and Émile Roux. Their original vaccine was harvested from infected rabbits, from which the virus in the nerve tissue was weakened by allowing it to dry for five to ten days. Similar nerve tissue-derived vaccines are still used in some countries, as they are much cheaper than modern cell culture vaccines. The human diploid cell rabies vaccine was started in 1967; however, a new and less expensive purified chicken embryo cell vaccine and purified vero cell rabies vaccine are now available. A recombinant vaccine called V-RG has been successfully used in Belgium, France, Germany, and the United States to prevent outbreaks of rabies in wildlife. Currently pre-exposure immunization has been used in both human and non-human populations, whereas in many jurisdictions domesticated animals are required to be vaccinated.

In the USA, since the widespread vaccination of domestic dogs and cats and the development of effective human vaccines and immunoglobulin treatments, the number of recorded deaths from rabies has dropped from one hundred or more annually in the early 20th century, to 1–2 per year, mostly caused by bat bites, which may go unnoticed by the victim and hence untreated.

The Missouri Dept. of Health and Senior Services Communicable Disease Surveillance 2007 Annual Report states that the following can help reduce the risk of exposure to rabies by :

1. Vaccinating dogs, cats, and ferrets against rabies
2. Keeping pets under supervision
3. Not handling wild animals or strays
4. Contacting an animal control officer, if you see a wild animal or a stray, especially if the animal is acting strangely.
5. Washing the wound with soap and water between 10–15 minutes, if you do get bitten by an animal, and contacting your health care provider to see if you need rabies post-exposure prophylaxis.
6. Getting pets spayed or neutered. Pets that are fixed are less likely to leave home, become strays, and make more stray animals.

September 28 is World Rabies Day, which promotes information on, and prevention and elimination of the disease.

In unvaccinated humans, rabies is almost always fatal after neurological symptoms have developed, but prompt post-exposure vaccination may prevent the virus from progressing. Rabies kills around 55,000 people a year, mostly in Asia and Africa. There are only six known cases of a person surviving symptomatic rabies, and only one known case of survival in which the patient received no rabies-specific treatment either before or after illness onset.

Any warm-blooded animal (including humans) may become infected with the rabies virus and develop symptoms (although birds have only been known to be experimentally infected). Indeed the virus has even been adapted to grow in cells of poikilothermic ("cold-blooded") vertebrates. Most animals can be infected by the virus and can transmit the disease to humans. Infected bats, monkeys, raccoons, foxes, skunks, cattle, wolves, coyotes, dogs, mongoose (normally yellow mongoose) or cats present the greatest risk to humans. Rabies may also spread through exposure to infected domestic farm animals, groundhogs, weasels, bears and other wild carnivores. Small rodents such as squirrels, hamsters, guinea pigs, gerbils, chipmunks, rats, and mice and lagomorphs like rabbits and hares are almost never found to be infected with rabies and are not known to transmit rabies to humans.

The virus is usually present in the nerves and saliva of a symptomatic rabid animal. The route of infection is usually, but not always, by a bite. In many cases the infected animal is exceptionally aggressive, may attack without provocation, and exhibits otherwise uncharacteristic behavior.

After a typical human infection by bite, the virus enters the peripheral nervous system. It then travels along the nerves towards the central nervous system. During this phase, the virus cannot be easily detected within the host, and vaccination may still confer cell-mediated immunity to prevent symptomatic rabies. When the virus reaches the brain, it rapidly causes encephalitis. This is called the prodromal phase, and is the beginning of the symptoms. Once the patient becomes symptomatic, treatment is almost never effective and mortality is over 99%. Rabies may also inflame the spinal cord producing transverse myelitis.

The rabies virus survives in widespread, varied, rural fauna reservoirs. It is present in the animal populations of almost every country in the world, except in Australia and New Zealand. In some countries like those in western Europe and Oceania, rabies is considered to be prevalent among bat populations only.

Because of its potentially violent nature, rabies has been known since c.2000 B.C. The first written record of rabies is in the Codex of Eshnunna (ca. 1930 BC), which dictates that the owner of a dog showing symptoms of rabies should take preventive measure against bites. If another person was bitten by a rabid dog and later died, the owner was heavily fined.

Rabies was considered a scourge for its prevalence in the 19th century. In France and Belgium, where Saint Hubert was venerated, the "St Hubert's Key" was heated and applied to cauterize the wound; by an application of magical thinking, dogs were branded with the key in hopes of protecting them from rabies. Fear of rabies related to methods of transmissions was almost irrational; however, this gave Louis Pasteur ample opportunity to test post-exposure treatments from 1885.

Pet insurance | Understanding and definition of Pet Insurance | The goal of pet insurance | Insurance for pet

Pet insurance pays the veterinary costs if one's pet becomes ill or is injured in an accident. Some policies will also pay out when the pet dies, or if it's lost or stolen.

The purpose of pet insurance is to mitigate the risk of incurring significant expense to treat ill or injured pets. As veterinary medicine is increasingly employing expensive medical techniques and drugs, and owners have higher expectations for their pets' health care and standard of living than previously, the market for pet insurance has increased.

The first pet insurance policy was written in 1890 by Claes Virgin. Virgin was the founder of Länsförsäkrings Alliance, at that time he focused on horses and livestock. In 1947 the first pet insurance policy was sold in Britain. As of 2009, Britain has the second-highest level of pet insurance in the world (23%), behind only Sweden. In 1982, the first pet insurance policy was sold in the United States, and issued to television's Lassie by Veterinary Pet Insurance (VPI).

Many pet owners believe pet insurance is a variation of human health insurance; however, pet insurance is actually a form of property insurance. As such, pet insurance reimburses the owner after the pet has received care and the owner submits a claim to the insurance company.

British policies usually pay 100% of vets fees, but this is certainly not always the case. It is typically more common to find UK pet insurance companies discounting their policies by offering their customers the chance to pay an excess fee, just like with motor insurance. Excess fees can range from £40 to £100. The excess is usually fixed by the insurer dependent on the amount of discount they are giving the buyer. In the future more flexible excess levels will probably play an important part of how much one pays for a pet insurance policy.

Policies in the United States and Canada either pay off a benefit schedule or pay a percentage of the vet costs (up to 90%), after reaching a deductible, depending on the company and the specific policy. The owner usually pays the amount due to the veterinarian and then sends in the claim form and receives reimbursement, which some companies and policies limit according to their own schedules of necessary and usual charges. For very high bills, some veterinarians allow the owner to put off payment until the insurance claim is processed . Some insurers pay veterinarians directly on behalf of customers. Most American and Canadian policies require the pet owner to submit a request for fees incurred.

Previously, most pet insurance plans did not pay for preventative care (such as vaccinations) or elective procedures (such as neutering). Recently, however, some companies in Canada, the United Kingdom, and the United States are offering routine-care coverage, sometimes called comprehensive coverage. Dental care, prescription drugs and alternative treatments, such as physiotherapy and acupuncture, are also covered by some providers.

There are two categories of insurance policies for pets: non-lifetime and lifetime. The first covers buyers for most conditions suffered by their pet during the course of a policy year but, on renewal in a following year, a condition that has been claimed for will be excluded. If that condition needs further treatment the pet owner will have to pay for that himself. The second category covers a pet for ongoing conditions throughout the pet’s lifetime so that, if a condition is claimed for in the first year, it will not be excluded in subsequent years. However, lifetime policies also have limits: some have limits “per condition”, others have limits “per condition, per year”, and others have limits “per year”, all of which have different implications for a pet owner whose pet needs treatment year after year, so it is wise to be clear which type of lifetime policy you are considering.

In addition, companies often limit coverage for pre-existing conditions in order to eliminate fraudulent consumers, thus giving owners an incentive to insure even very young animals, who are not expected to incur high veterinary costs while they are still healthy. There is usually a short period after a pet insurance policy is bought when the holder will be unable to claim for sickness, often no more than 14 days from inception. This is to cover illnesses contracted before the pet was covered but whose symptoms appeared only after coverage has begun.

Some insurers offer options not directly related to pet health, including covering boarding costs for animals whose owners are hospitalized, or costs (such as rewards or posters) associated with retrieving lost animals. Some policies also include travel cancellation coverage if owners must remain with pets who need urgent treatment or are dying.

Some British policies for dogs also include third-party liability insurance. Thus, for example, if a dog causes a car accident that damages a vehicle, the insurer will pay to rectify the damage for which the owner is responsible under the Animals Act 1971.

Many pet insurance companies are beginning to offer the pet owner more of an ability to customize their coverage by allowing them to choose their own level of deductible or co-insurance. This allows the pet owner to control their monthly premium and choose the level of coverage that suits them the best.

The smart consumer will always check the details before signing up for a policy which may not suit the needs of your budget and/or your pet. There are a number of differences between pet insurance companies. These differences often impact the cost of the monthly premium or the way in which you would get reimbursed after a veterinary visit. Some of the main differences are:

1. Whether congenital and hereditary conditions (like hip dysplasia, heart defects, eye cataracts or diabetes) are covered;
2. How the reimbursement is calculated (based on the actual vet bill, a benefit schedule or usual and customary rates);
3. Whether there are any limits or caps applied (per incident, per year or over the pet’s lifetime); and
4. Whether there is an annual contract that determines anything diagnosed in the previous year of coverage is considered pre-existing the next year.

Glossary

1. 'Benefit schedule' – a document created by a pet insurance company that lists allowances paid for a given diagnosis and treatment.
2. 'Deductible' - a fixed amount that must be paid by the policy holder for covered veterinary services before the pet insurance company will pay benefits. Higher deductibles usually translate to lower policy premiums. Deductibles are either annual or per-incident. Once a pet owner reaches the annual deductible limit, any future claims during that policy year won't be subject to anymore deductible. The per-incident deductible must be paid each time the pet is presented with a new problem.
3. 'Exclusion' - a condition that is excluded, or not covered under a pet insurance policy.
4. 'Policy Limits' - there can be several types of policy limits applied to a pet insurance policy. When a policy limit is reached the policy will normally no longer pay applicable claims. Typical policy limits are lifetime, annual and per-incident.
5. 'Pre-certification' – when a pet owner to submits a requested treatment to their pet insurance company to see if the treatment will be covered, and at what benefit level.
6. 'Pre-existing condition' - an injury or illness that occurred before the pet insurance policy became effective. Some pre-existing conditions are eligible for coverage after being cured and a specified period of time elapses. Other conditions cannot ever be covered regardless of time elapsed.
7. 'Coinsurance' - also referred to as 'copay' - the percentage of your claim for which you are liable before any applicable deductible is applied. However, when figuring reimbursements, some companies subtract the deductible before subtracting the copay. Generally, it is preferable to select a lower copay since it is a percentage of the total bill, whereas the deductible is a fixed, known amount.

Firefly | Understanding and definition of Firefly | The fire fly

Lampyridae is a family of insects in the beetle order Coleoptera. They are winged beetles, and commonly called fireflies or lightning bugs for their conspicuous crepuscular use of bioluminescence to attract mates or prey. Fireflies produce a "cold light", with no infrared or ultraviolet frequencies. This chemically-produced light from the lower abdomen may be yellow, green, or pale-red, with wavelengths from 510 to 670 nanometers.

There are 2,000 species of firefly found in temperate and tropical environments. Many are in marshes or in wet, wooded areas where their larvae have abundant sources of food. These larvae emit light and are often called "glowworms", in particular, in Eurasia. In the Americas, "glow worm" also refers to the related Phengodidae.

Fireflies, also known as glow worms, tend to be brown and softbodied, often with the elytra more leathery than in other beetles. Though the females of some species are similar in appearance to males, larviform females are found in many other firefly species. These females can often be distinguished from the larvae only because they have compound eyes. The most commonly-known fireflies are nocturnal, though there are numerous species that are diurnal. Most diurnal species are non-luminescent, though some species that remain in shadowy areas can produce light.

A few days after mating, a female lays her fertilized eggs on or just below the surface of the ground. The eggs hatch 3–4 weeks later and the larvae feed until the end of the summer. The larvae are commonly called glowworms, not to be confused with the distinct beetle family Phengodidae or fly genus Arachnocampa. Lampyrid larvae have simple eyes. The term glowworm is also used for both adults and larvae of species such as Lampyris noctiluca, the common European glowworm, in which only the non-flying adult females glow brightly and the flying males glow only weakly and intermittently.

Fireflies hibernate over winter during the larval stage, some species for several years. Some do this by burrowing underground, while others find places on or under the bark of trees. They emerge in the spring. After several weeks of feeding, they pupate for 1 to 2.5 weeks and emerge as adults. The larvae of most species are specialized predators and feed on other larvae, terrestrial snails, and slugs. One such species is Alecton discoidalis which is found in Cuba. Some are so specialized that they have grooved mandibles that deliver digestive fluids directly to their prey. Adult diet varies. Some are predatory, while others feed on plant pollen or nectar.

Most fireflies are quite distasteful and sometimes poisonous to vertebrate predators. This is due at least in part to a group of steroid pyrones known as lucibufagins (LBGs), which are similar to cardiotonic bufadienolides found in some poisonous toads.

Light production in fireflies is due to a type of chemical reaction called bioluminescence. This process occurs in specialised light-emitting organs, usually on a firefly's lower abdomen. The enzyme luciferase acts on the luciferin, in the presence of magnesium ions, ATP, and oxygen to produce light. Genes coding for these substances have been inserted into many different organisms (see Luciferase – Applications). Firefly luciferase is used in forensics, and the enzyme has medical uses — in particular, for detecting the presence of ATP or magnesium. It has been speculated that Baroque painter Caravaggio may have prepared his canvases with a powder of dried fireflies to create a photosensitive surface on which he projected the image to be painted.

All fireflies glow as larvae. Bioluminescence serves a different function in lampyrid larvae than it does in adults. It appears to be a warning signal to predators, since many firefly larvae contain chemicals that are distasteful or toxic.

It was originally thought that light in adult beetles was used for similar warning purposes, but it is now understood that its primary purpose is for use in mate selection. Now fireflies are a classic example of an organism that uses bioluminescence for sexual selection. They have evolved a variety of ways to communicate with mates in courtships: steady glows, flashing, as well as the use of chemical signals unrelated to photic systems.

Some species, especially lightning bugs of the genera Photinus, Photuris, and Pyractomena, are distinguished by the unique courtship flash patterns emitted by flying males in search of females. In general, females of the Photinus genus do not fly, but do give a flash response to males of their own species.

Tropical fireflies, in particular, in Southeast Asia, routinely synchronise their flashes among large groups. This phenomenon is explained as phase synchronization and spontaneous order. At night along river banks in the Malaysian jungles (the most notable ones found near Kuala Selangor), fireflies ("kelip-kelip" in the Malay language or Bahasa Malaysia) synchronise their light emissions precisely. Current hypotheses about the causes of this behavior involve diet, social interaction, and altitude. In the Philippines, thousands of fireflies can be seen all year-round in the town of Donsol (called aninipot or totonbalagon in Bicol). In the United States, one of the most famous sightings of fireflies blinking in unison occurs annually near Elkmont, Tennessee in the Great Smoky Mountains during the first weeks of June. Congaree National Park in South Carolina is another host to this phenomenon.

Female Photuris fireflies are known for mimicking the mating flashes of other "lightning bugs" for the sole purpose of predation. Target males are attracted to what appears to be a suitable mate, and are then eaten. For this reason the Photuris species are sometimes referred to as "femme fatale fireflies."

Many fireflies do not produce light. Usually these species are diurnal, or day-flying, such as those in the genus Ellychnia. A few diurnal fireflies that inhabit primarily shadowy places, such as beneath tall plants or trees, are luminescent. One such genus is Lucidota. These fireflies use pheromones to signal mates. This is supported by the fact that some basal groups do not show bioluminescence and, rather, use chemical signaling. Phosphaenus Hemipterus has photic organs, yet is a diurnal firefly and displays large antennae and small eyes. These traits strongly suggests that pheromones are used for sexual selection, while photic organs are used for warning signals. In controlled experiments, males coming from downwind arrived at females first, thus male arrival was correlated with wind direction, indicating males' chemotaxis into a pheromone plume. It was also found that males were able to find females without the use of visual cues, when the sides of test petri dishes were covered with black tape. This and the facts that females do not light up at night and males are diurnal point to the conclusion that sexual communication in P. Hemipterus is entirely based on pheromones.

Firefly systematics, as with many insects, are in a constant state of flux, as new species continue to be discovered. The five subfamilies listed above are the most commonly accepted ones, though others such as the Amydetinae and Psilocladinae have been proposed. This was mainly done in an attempt to revise the Lampyrinae, which bit by bit had become something of a "wastebin taxon" to hold incertae sedis species and genera of fireflies. Other changes have been proposed, such as merging the Ototetrinae into the Luciolinae, but the arrangement used here appears to be the most frequently-seen and stable layout for the time-being. Though most groups appear to be monophyletic, some (e.g., the tribe Photinini) are perhaps better split up.

There seem to be two groups of subfamilies: one containing many American and some Eurasian species in the Lampyrinae and Photurinae, and one predominantly Asian one made up from the other subfamilies. While the subfamilies as understood here are, in general, monophyletic, there are still a few genera that need to be moved about for the subfamilies to accurately represent the evolutionary relationships among the fireflies.

The Rhagophthalmidae are a glow worm-like lineage of Elateroidea. They have in the recent past usually been considered a distinct family, but it is still disputed as to whether this is correct. Indeed, they might be the only close relative of the puzzling firefly genus Pterotus, which sometimes is placed in a monotypic subfamily.

The genus Phausis, usually placed in the tribe Photinini of the Lampyrinae, might represent another rather distinct lineage instead.

Golden Retriever | History and definition Golden Retriever

The Golden Retriever is a medium-sized breed of dog. They were historically developed as gundogs to retrieve shot waterfowl such as ducks and upland game birds during hunting and shooting parties. As such, they were bred to have a soft mouth to retrieve game undamaged and have an instinctive love of water. The golden retriever has a dense inner coat that provides it with adequate warmth. The outer coat is sleek and water repellent, and lies flat against the body. The official colour of the breed is the varying shades of gold that are most often seen.

The breed's intelligence and versatility suit the dogs well for a variety of roles including guide dog for the blind, hearing dog for deaf people, hunting dog, illegal drug detector, and search and rescue participant. Because of their loyal and gentle temperament, golden retrievers are also popular family pets.

Golden Retrievers possess a friendly, eager-to-please demeanour, and are the fourth most popular family dog breeds (by registration) in the United States, the fifth most popular in Australia, and the eighth most popular in the United Kingdom.

The Golden Retriever was first developed in Scotland at "Guisachan" near Glen Affric, the highland estate of Sir Dudley Marjoribanks later Baron Tweedmouth. For many years, there was controversy over which breeds were originally crossed. In 1952, the publication of Marjoribanks' breeding records from 1835 to 1890 dispelled the myth concerning the purchase of a whole troupe of Russian sheepdogs from a visiting circus.

Improvements in guns during the 1800s resulted in more fowl being downed during hunts at greater distances and over increasingly difficult terrain. This led to more birds being lost in the field. Because of this improvement in firearms, a need for a specialist retriever arose as training setter and pointer breeds in retrieval was found to be ineffective. Thus work began on the breeding of the dog to fill this much needed role.

The original cross was of a yellow-coloured Retriever, Nous, with a Tweed Water Spaniel female dog, Belle. The Tweed Water Spaniel is now extinct but was then common in the border country. Marjoribanks had purchased Nous in 1865 from an unregistered litter of otherwise black wavy-coated retriever pups. In 1868, this cross produced a litter that included four pups; these four became the basis of a breeding program which included the Irish Setter, the sandy-coloured Bloodhound, the St. John's Water Dog of Newfoundland, and two more wavy-coated black Retrievers. The bloodline was also inbred and selected for trueness to Marjoribanks' idea of the ultimate hunting dog. His vision included a more vigorous and powerful dog than previous retrievers, one that would still be gentle and trainable. Russian sheepdogs are not mentioned in these records, nor are any other working dog breeds. The ancestry of the Golden Retriever is all sporting dogs, in line with Marjoribanks' goals.

Golden Retrievers were first accepted for registration by The Kennel Club of England in 1903, as Flat Coats – Golden. They were first exhibited in 1908, and in 1911 were recognised as a breed described as Retriever (Golden and Yellow). In 1913, the Golden Retriever Club was founded. The breed name was officially changed to Golden Retriever in 1920.

The Honourable Archie Marjoribanks took a Golden Retriever to Canada in 1881, and registered Lady with the American Kennel Club (AKC) in 1894. These are the first records of the breed in these two countries. The breed was first registered in Canada in 1927, and the Golden Retriever Club of Ontario, now the Golden Retriever Club of Canada, was formed in 1958. The co-founders of the GRCC were Cliff Drysdale, an Englishman who had brought over an English Golden and Jutta Baker, daughter in law of Louis Baker who owned Northland Kennels, possibly Canada's first kennel dedicated to Goldens. The AKC recognised the breed in 1925, and in 1938 the Golden Retriever Club of America was formed.

There are also organisations other than clubs dedicated to golden retrievers, such as breed specific adoption sites.

In July 2006, The Golden Retriever Club of Scotland organised a gathering of Golden Retriever enthusiasts at the ancestral home of Guisachan House. A photograph was taken by photographer Lynn Kipps to commemorate the occasion. It captures 188 Golden Retrievers and therefore holds the record for most Golden Retrievers captured in one image.

Coat and colour

As indicated by their name, their coat comes in light golden colours to dark golden colours. The coat and undercoat are dense and waterproof, and may be straight or moderately wavy. It usually lies flat against the belly. The American Kennel Club (AKC) standard states that the coat is a "rich, lustrous golden of various shades", disallowing coats that are extremely light or extremely dark. This leaves the outer ranges of coat colour up to a judge's discretion when competing in conformation shows. Therefore, "pure white" and "red" are unacceptable colours like black . The Kennel Club (UK) also permits cream as an acceptable coat colour. Judges may also disallow Goldens with pink noses, or those lacking pigment. The Golden's coat can also be of a mahogany colour, referred to as "redheads", although this is not accepted in the British show ring. As a Golden grows older, its coat can become darker or lighter, along with a noticeable whitening of the fur on and around the muzzle. Puppy coats are usually much lighter than their adult coats, but a puppy with a darker colouration at the tips of the ears may indicate a darker adult colour. A golden's coat should never be too long, as this may prove to be a disservice to them in the field, especially when retrieving game.

The temperament of the Golden Retriever is a hallmark of the breed and is described in the standard as "kindly, friendly and confident". They are not "one man dogs" and are generally equally amiable with both strangers and those familiar to them. Their trusting, gentle disposition therefore makes them a poor guard dog. Any form of unprovoked aggression or hostility towards either people, dogs or other animals, whether in the show ring or community, is completely unacceptable in a Golden Retriever and is not in keeping with the character of the breed and as such is considered a serious fault. Nor should a Golden Retriever be unduly timid or nervous. The typical Golden Retriever is calm, naturally intelligent and biddable, with an exceptional eagerness to please.

Golden Retrievers are also noted for their intelligence, it ranks fourth in Stanley Coren's The Intelligence of Dogs following the Border Collie, Poodle, and German Shepherd Dog, being one of the brightest dogs ranked by obedience command trainability. These dogs are also renowned for their patience with children.

By the time they reach maturity however, Goldens will have become active and fun-loving animals with the exceptionally patient demeanour befitting a dog bred to sit quietly for hours in a hunting blind. Adult Golden Retrievers love to work, and have a keen ability to focus on a given task. They will seemingly work until they collapse, so care should be taken to avoid overworking them.

Other characteristics related to their hunting heritage are a size suited for scrambling in and out of boats and an inordinate love for water. Golden Retrievers are exceptionally trainable—due to their intelligence, athleticism and desire to please their handlers—and generally excel in obedience trials. They are also very competitive in agility and other performance events. Harsh training methods are unnecessary as Golden Retrievers often respond very well to positive and upbeat training styles.

Golden Retrievers are compatible with children and adults and are good with other dogs, cats and most livestock. Golden Retrievers are particularly valued for their high level of sociability towards people, calmness, and willingness to learn. Because of this, they are commonly used as guide dogs, mobility assistance dogs, and search and rescue dogs. They are friendly and tend to learn tricks easily.

They are also known to become excellent surrogate mothers to different species. Kittens and even tiger cubs from zoos are well taken care of by golden retrievers. In some cases, a retriever may produce milk for her adopted even though she may not have been pregnant or nursing recently.

The average life span for a Golden Retriever is 11 to 11½ years. Golden Retrievers are susceptible to specific ailments. A responsible breeder will proactively minimise the risk of illness by having the health of dogs in breeding pairs professionally assessed and selected on the basis of complementary traits.

Golden retrievers are known to have genetic disorders and other diseases. Hip dysplasia is common in the breed; when buying a puppy, the pedigree should be known and be examined by the OFA or by PennHIP for hip disease.

The Golden Retriever's eagerness to please has made them consistent, top performers in the obedience and agility rings. Plus with their excellent swimming ability they are great at dock jumping. Their natural retrieving ability also sees them excel in flyball and field trials.

The first three dogs ever to achieve the AKC Obedience Champion title were Golden Retrievers; the first of the three was a female named Ch. Moreland's Golden Tonka.

The breed is used in water rescue/lifesaving. It continues in that role today, along with the Leonberger, Newfoundland and Labrador Retriever dogs; they are used at the Italian School of Canine Lifeguard.

Turtle | Understanding and definition of Turtle | World turtle

Turtles are reptiles of the order Testudines (the crown group of the superorder Chelonia), characterised by a special bony or cartilaginous shell developed from their ribs that acts as a shield. "Turtle" may either refer to the Testudines as a whole, or to particular Testudines which make up a form taxon that is not monophyletic—see also sea turtle, terrapin, tortoise, and the discussion below.

The order Testudines includes both extant (living) and extinct species. The earliest known turtles date from 215 million years ago, making turtles one of the oldest reptile groups and a more ancient group than lizards, snakes and crocodiles. Of the many species alive today, some are highly endangered.

Like other reptiles, turtles are ectotherms—their internal temperature varies according to the ambient environment, commonly called cold-blooded. However, leatherback sea turtles have noticeably higher body temperature than surrounding water because of their high metabolic rate.

Like other amniotes (reptiles, dinosaurs, birds, and mammals), they breathe air and do not lay eggs underwater, although many species live in or around water. The largest turtles are aquatic.

The largest living chelonian is the leatherback sea turtle (Dermochelys coriacea), which reaches a shell length of 200 centimetres (6.6 ft) and can reach a weight of over 900 kilograms (2,000 lb). Freshwater turtles are generally smaller, but with the largest species, the Asian softshell turtle Pelochelys cantorii, a few individuals have been reported up to 200 centimetres (6.6 ft). This dwarfs even the better-known alligator snapping turtle, the largest chelonian in North America, which attains a shell length of up to 80 centimetres (2.6 ft) and a weight of about 60 kilograms (130 lb). Giant tortoises of the genera Geochelone, Meiolania, and others were relatively widely distributed around the world into prehistoric times, and are known to have existed in North and South America, Australia, and Africa. They became extinct at the same time as the appearance of man, and it is assumed humans hunted them for food. The only surviving giant tortoises are on the Seychelles and Galápagos Islands, and can grow to over 130 centimetres (51 in) in length, and weigh about 300 kilograms (660 lb).

The largest ever chelonian was Archelon ischyros, a Late Cretaceous sea turtle known to have been up to 4.6 metres (15 ft) long.

The smallest turtle is the speckled padloper tortoise of South Africa. It measures no more than 8 centimetres (3.1 in) in length and weighs about 140 grams (4.9 oz). Two other species of small turtles are the American mud turtles and musk turtles that live in an area that ranges from Canada to South America. The shell length of many species in this group is less than 13 centimetres (5.1 in) in length.

Most turtles that spend most of their lives on land have their eyes looking down at objects in front of them. Some aquatic turtles, such as snapping turtles and soft-shelled turtles, have eyes closer to the top of the head. These species of turtles can hide from predators in shallow water, where they lie entirely submerged except for their eyes and nostrils. Sea turtles possess glands near their eyes that produce salty tears that rid their body of excess salt taken in from the water they drink.

Turtles are thought to have exceptional night vision due to the unusually large number of rod cells in their retinas. Turtles have color vision with a wealth of cone subtypes with sensitivities ranging from the near ultraviolet (UV A) to red. Some land turtles have very poor pursuit movement abilities, which are normally reserved for predators that hunt quick moving prey, but carnivorous turtles are able to move their heads quickly to snap.

Turtles have a rigid beak. Turtles use their jaws to cut and chew food. Instead of teeth, the upper and lower jaws of the turtle are covered by horny ridges. Carnivorous turtles usually have knife-sharp ridges for slicing through their prey. Herbivorous turtles have serrated-edged ridges that help them cut through tough plants. Turtles use their tongues to swallow food, but they cannot, unlike most reptiles, stick out their tongues to catch food.

The upper shell of the turtle is called the carapace. The lower shell that encases the belly is called the plastron. The carapace and plastron are joined together on the turtle's sides by bony structures called bridges. The inner layer of a turtle's shell is made up of about 60 bones that include portions of the backbone and the ribs, meaning the turtle cannot crawl out of its shell. In most turtles, the outer layer of the shell is covered by horny scales called scutes that are part of its outer skin, or epidermis. Scutes are made up of a fibrous protein called keratin that also makes up the scales of other reptiles. These scutes overlap the seams between the shell bones and add strength to the shell. Some turtles do not have horny scutes. For example, the leatherback sea turtle and the soft-shelled turtles have shells covered with leathery skin instead.

The rigid shell means turtles cannot breathe as other reptiles do, by changing the volume of their chest cavity via expansion and contraction of the ribs. Instead, turtles breathe in two ways. First, they employ buccal pumping, pulling air into their mouth, then pushing it into the lungs via oscillations of the floor of the throat. Secondly, by contracting the abdominal muscles that cover the posterior opening of the shell, the internal volume of the shell increases, drawing air into the lungs, allowing these muscles to function in much the same way as the mammalian diaphragm.

The shape of the shell gives helpful clues to how a turtle lives. Most tortoises have a large, dome-shaped shell that makes it difficult for predators to crush the shell between their jaws. One of the few exceptions is the African pancake tortoise, which has a flat, flexible shell that allows it to hide in rock crevices. Most aquatic turtles have flat, streamlined shells which aid in swimming and diving. American snapping turtles and musk turtles have small, cross-shaped plastrons that give them more efficient leg movement for walking along the bottom of ponds and streams.

The color of a turtle's shell may vary. Shells are commonly colored brown, black, or olive green. In some species, shells may have red, orange, yellow, or grey markings and these markings are often spots, lines, or irregular blotches. One of the most colorful turtles is the eastern painted turtle which includes a yellow plastron and a black or olive shell with red markings around the rim.

Tortoises, being land-based, have rather heavy shells. In contrast, aquatic and soft-shelled turtles have lighter shells that help them avoid sinking in water and swim faster with more agility. These lighter shells have large spaces called fontanelles between the shell bones. The shells of leatherback sea turtles are extremely light because they lack scutes and contain many fontanelles.

As mentioned above, the outer layer of the shell is part of the skin; each scute (or plate) on the shell corresponds to a single modified scale. The remainder of the skin is composed of skin with much smaller scales, similar to the skin of other reptiles. Turtles do not molt their skins all at once, as snakes do, but continuously, in small pieces. When kept in aquaria, small sheets of dead skin can be seen in the water (often appearing to be a thin piece of plastic) having been sloughed off when the animal deliberately rubs itself against a piece of wood or stone. Tortoises also shed skin, but a lot of dead skin is allowed to accumulate into thick knobs and plates that provide protection to parts of the body outside the shell.

By counting the rings formed by the stack of smaller, older scutes on top of the larger, newer ones, it is possible to estimate the age of a turtle, if one knows how many scutes are produced in a year. This method is not very accurate, partly because growth rate is not constant, but also because some of the scutes eventually fall away from the shell.

Terrestrial tortoises have short, sturdy feet. Tortoises are famous for moving slowly, in part because of their heavy, cumbersome shell, which restricts stride length.

The amphibious turtles normally have limbs similar to those of tortoises, except the feet are webbed and often have long claws. These turtles swim using all four feet in a way similar to the dog paddle, with the feet on the left and right side of the body alternately providing thrust. Large turtles tend to swim less than smaller ones, and the very big species, such as alligator snapping turtles, hardly swim at all, preferring to simply walk along the bottom of the river or lake. As well as webbed feet, turtles have very long claws, used to help them clamber onto riverbanks and floating logs, upon which they like to bask. Male turtles tend to have particularly long claws, and these appear to be used to stimulate the female while mating. While most turtles have webbed feet, some, such as the pig-nosed turtle, have true flippers, with the digits being fused into paddles and the claws being relatively small. These species swim in the same way as sea turtles (see below).

Sea turtles are almost entirely aquatic and have flippers instead of feet. Sea turtles fly through the water, using the up-and-down motion of the front flippers to generate thrust; the back feet are not used for propulsion, but may be used as rudders for steering. Compared with freshwater turtles, sea turtles have very limited mobility on land, and apart from the dash from the nest to the sea as hatchlings, male sea turtles normally never leave the sea. Females must come back onto land to lay eggs. They move very slowly and laboriously, dragging themselves forwards with their flippers.

Although many turtles spend large amounts of their lives underwater, all turtles and tortoises breathe air, and must surface at regular intervals to refill their lungs. They can also spend much of their lives on dry land. Aquatic respiration in Australian freshwater turtles is currently being studied. Some species have large cloacal cavities that are lined with many finger-like projections. These projections, called papillae, have a rich blood supply, and increase the surface area of the cloaca. The turtles can take up dissolved oxygen from the water using these papillae, in much the same way that fish use gills to respire.

Turtles lay eggs, like other reptiles, which are slightly soft and leathery. The eggs of the largest species are spherical, while the eggs of the rest are elongated. Their albumen is white and contains a different protein from bird eggs, such that it will not coagulate when cooked. Turtle eggs prepared to eat consist mainly of yolk. In some species, temperature determines whether an egg develops into a male or a female: a higher temperature causes a female, a lower temperature causes a male. Large numbers of eggs are deposited in holes dug into mud or sand. They are then covered and left to incubate by themselves. When the turtles hatch, they squirm their way to the surface and head toward the water. There are no known species in which the mother cares for the young.

Sea turtles lay their eggs on dry, sandy beaches. Immature sea turtles are not cared for by the adults. Turtles can take many years to reach breeding age, and in many cases breed every few years rather than annually.

Researchers have recently discovered a turtle’s organs do not gradually break down or become less efficient over time, unlike most other animals. It was found that the liver, lungs, and kidneys of a centenarian turtle are virtually indistinguishable from those of its immature counterpart. This has inspired genetic researchers to begin examining the turtle genome for longevity genes.

Turtles, particularly small terrestrial and freshwater turtles, are commonly kept as pets. Among the most popular are Russian tortoises, spur-thighed tortoises, and red-eared sliders.

In the United States, due to the ease of contracting salmonellosis through casual contact with turtles, the U.S. Food and Drug Administration (FDA) established a regulation in 1975 to discontinue the sale of turtles under 4 inches. It is illegal in every state in the U.S. for anyone to sell any turtles under 4 inches (10 cm) long. Many stores and flea markets still sell small turtles due to a loophole in the FDA regulation which allows turtles under 4 inches to be sold for educational purposes.

Some states have other laws and regulations regarding possession of red-eared sliders as pets because they are looked upon as invasive species or pests where they are not native, but have been introduced through the pet trade. As of July 1, 2007, it is illegal in Florida to sell any wild type red-eared slider. Unusual color varieties such as albino and pastel red-eared sliders, which are derived from captive breeding, are still allowed for sale.

Broiler | Understanding and definition of Broilers | How to maintain Broiler | White chicken

A broiler is a type of chicken raised specifically for meat production. Modern commercial broilers, typically known as Cornish crosses or Cornish-Rocks are specially bred for large scale, efficient meat production and grow much faster than egg or traditional dual purpose breeds. They are noted for having very fast growth rates, a high feed conversion ratio, and low levels of activity. Broilers often reach a harvest weight of 4-5 pounds dressed in only five weeks.

They have white feathers and yellowish skin. This cross is also favorable for meat production because it lacks the typical "hair" which many breeds have that necessitates singeing after plucking. Both male and female broilers are slaughtered for their meat. In 2003, approximately 42 billion broilers were produced, 80% of which were produced by four companies: Aviagen, Cobb-Vantress, Hubbard Farms, and Hybro.

Before the development of modern commercial meat breeds (cows, chickens, etc.) broilers consisted mostly of young male chickens (cockerels) which were culled from farm flocks. The males were slaughtered for meat and the females (pullets) were kept for egg production. Compared to today, this made chicken meat scarce and expensive compared to eggs, and chicken was a luxury meat. The development of special broiler breeds decoupled the supply of broilers from the demand for eggs. This, along with advances in nutrition and incubation that allowed broilers to be raised year-round, allowed chicken to become a low-cost meat.

Broilers are often called "Rock-Cornish," referring to the adoption of a hybrid variety of chicken produced from a cross of male of a naturally double breasted Cornish strain and a female of a tall, large boned strain of white Plymouth Rocks. This first attempt at a hybrid meat breed was introduced in the 1930s and became dominant in the 1960s. The original cross was plagued by problems of low fertility, slow growth, and disease susceptibility, and modern broilers have gradually become very different from the Cornish x Rock hybrid.

Access to a special diet of high protein feed delivered via an automated feeding system. This is combined with artificial lighting conditions to stimulate growth and thus the desired body weight is achieved in 4 - 8 weeks, depending on the approximate body weight required by the processing plant. After processing, the poultry is delivered as fresh or frozen chicken to the stores and supermarkets.

Five day old broiler strain Cornish-Rock chicks.

Because of their efficient meat conversion, broiler chickens are also popular in small family farms in rural communities, where a family will raise a small flock of broilers.

Broilers are sometimes reared on a grass range using a method called pastured poultry, as developed by Joel Salatin and promoted by the American Pastured Poultry Producers Association.

The term "broiler" is widely known in North America, Australia and England but not elsewhere in the English speaking world. The term "broiler chicken" is very widely used in Pakistan and India, as it was in the former German Democratic Republic and still nowadays in some eastern parts of Germany. The term is also used in Indonesia, Sweden, Finland, Poland, Turkey and the Balkans.

Broiler chickens may develop several health issues as a result of selective breeding. Broiler chickens are bred to be very large to produce the most meat per animal. The large chickens cannot stand because their bodies grow too quickly for their legs. Therefore, they may become lame or suffer from broken legs. Broiler chickens are also prone to heart attacks for the same reason, as the heart cannot support blood flow to the large body of the chicken. Another issue with selective breeding is the larger chickens have a more aggressive appetite. The broilers are feed restricted and this leads to behavioral issues in chronically hungry birds.

Broiler chickens may often get joint disorders because their legs cannot bear the heavy bodies. A Swedish study by SLU Skara (Swedish farming university) revealed that only 1/3 of studied broiler chickens that were about to be slaughtered were healthy. Additionally, it is very inactive and as a result is a poor forager, prone to predation, and is generally not suited to small free range homestead flocks.

If the litter in the pen is not properly managed to prevent birds from standing and resting in their feces, painful hock burns and foot ulcerations and blisters can occur. Pastured birds which are rotated frequently typically do not have these issues.

Bird Peacock | Definition of Bird Peacock | Today most beautiful bird

Peacock Peacock Blue or India, which the scientific name Pavo cristatus is one of three species of bird peacock. Peacock Blue has a glossy dark blue feathers. Adult male birds are large, can reach 230cm in length, with a very long tail cover green metallic. Above their heads is crested blue vertical fan shape. Female birds are smaller than males. Feathers not glossy, greenish brown with black stripes and without feathers adorned the cover tail. Young birds such as female.

Blue Peacock population scattered in open forests with grasslands in India, Pakistan, Sri Lanka, Nepal and Bhutan. Previously this species was found also in Bangladesh, but now most probably extinct there.
Male peacock is polygamous species, have more than one partner. In the breeding season, male birds show off their tail feathers in front of a female bird. Tail feathers cover is opened to form a fan with blue eye-shaped spots. Female birds incubate usually three to six eggs.

Blue Peacock bird feed consists of various grains, grass shoots and leaves, various insects, and various kinds of small animals such as worms, spiders and small lizards. Blue Peacock is the national bird of India. This species also play an important role in the mythology of Buddhist, Hindu and other cultures. Peacock Blue Bird evaluated as low risk in the IUCN Red List.

Devil Bird | Night Bird | That horrible bird species

Owls are a group of birds that are members of the order Strigiformes. This bird belonged to bird of prey (carnivores, meat eaters) and an animal night (nocturnal). Altogether, there are about 222 species known, which spread throughout the world except Antarctica, most of Greenland, and some remote islands.

In the western world, this animal is considered a symbol of wisdom, but in some places in Indonesia are considered carriers of foreshadowing of death, hence the name Owl. However not in all places in the archipelago this bird called the owl. In Java, for example, the name of this bird is darès or Manuk darès that there is no connotation with death or ghosts. In North Sulawesi, owls known as the Manguni.

The owl is known for his big eyes and facing forward, not like most other bird species whose eyes facing sideways. Together with a hooked beak sharp as an eagle beak and feather arrangement on the head that form a circle of faces, the "face" of the owl is so impressive and sometimes scary. Moreover, the bird's neck is so flexible so that his face can rotate 180 degrees to the rear.

Generally mottled owl furry, brown or gray with dark patches and white. Combined with behavior that often froze and did not move much, making this bird is not easily visible, so even when sleeping in the daytime under cover of the leaves.

Owl tail generally short, but large and broad wings. Wing span of approximately three times the body length.

Crane birds | History and definition of Crane birds

Cranes are a family, Gruidae, of large, long-legged and long-necked birds in the order Gruiformes. There are fifteen species of crane in four genera. Unlike the similar-looking but unrelated herons, cranes fly with necks outstretched, not pulled back. Cranes live on all continents except Antarctica and South America.

Most species of cranes are at least threatened, if not critically endangered, within their range. The plight of the Whooping Cranes of North America inspired some of the first US legislation to protect endangered species.

They are opportunistic feeders that change their diet according to the season and their own nutrient requirements. They eat a range of items from suitably sized small rodents, fish, amphibians, and insects, to grain, berries, and plants.

Most have elaborate and noisy courting displays or "dances". While folklore often states that cranes mate for life, recent scientific research indicates that these birds do change mates over the course of their lifetimes (Hayes 2005), which may last several decades. Cranes construct platform nests in shallow water, and typically lay two eggs at a time. Both parents help to rear the young, which remain with them until the next breeding season.

Some species and populations of cranes migrate over long distances; others do not migrate at all. Cranes are solitary during the breeding season, occurring in pairs, but during the non-breeding season they are gregarious, forming large flocks where their numbers are sufficient.

The cranes are large to very large birds, including the world's tallest flying bird. They range in size from the Demoiselle Crane, which measures 90 cm (35 in) in length, to the Sarus Crane, which can be up to 176 cm (69 in), although the heaviest is the Red-crowned Crane, which can weigh 12 kg (26 lb) prior to migrating. They are long-legged and long-necked birds with streamlined bodies and large rounded wings. The males and females do not vary in external appearance, but on average males tend to be slightly larger than females.

The plumage of the cranes varies by habitat. Species inhabiting vast open wetlands tend to have more white in the plumage than do species that inhabit smaller wetlands or forested habitats, which tend to be more grey. These white species are also generally larger. The smaller size and colour of the forest species is thought to help them maintain a less conspicuous profile while nesting; two of these species (the Common and Sandhill Cranes) also daub their feathers with mud to further hide while nesting. Most species of crane have some areas of bare skin on the face, the only two exceptions are the Blue and Demoiselle Cranes. This skin is used in communication with other cranes, and can be expanded by contracting and relaxing muscles, and change the intensity of colour. Feathers on the head can be moved and erected in the Blue, Wattled and Demoiselle Cranes for signalling as well. Also important to communication is the position and length of the trachea. In the two crowned-cranes the trachea is shorter and only slightly impressed upon the bone of the sternum, whereas the trachea of the other species is longer and penetrates the sternum. In some species the entire sternum is fused to the bony plates of the trachea, and this helps amplify the crane's calls, allowing them to carry for several kilometres.