Vulture

Vulture is the name given to two groups of convergently evolved, usually scavenging birds of prey: the New World vultures, including theCalifornian and Andean condors; and the Old World vultures, including the birds that are seen scavenging on carcasses of dead animalson African plains. Research has shown that some traditional Old World vultures (including the bearded vulture) are not closely related to the others, which is why the vultures are to be subdivided into three taxa rather than two. New World vultures are found in North and South America; Old World vultures are found in Europe, Africa and Asia, meaning that between the two groups, vultures are found on every continent except Australia and Antarctica.  

A particular characteristic of many vultures is a bald head, devoid of normal feathers. Although, it has been historically believed to help keep the head clean when feeding, research has shown that the bare skin may play an important role in thermoregulation. Vultures have been observed to hunch their bodies and tuck in their heads in the cold, and open their wings and stretch their necks in the heat.

Vultures rarely attack healthy animals, but may kill the wounded or sick. When a carcass has too thick a hide for its beak to open, it waits for a larger scavenger to eat first. Vast numbers have been seen upon battlefields. They gorge themselves when prey is abundant, until their crop bulges, and sit, sleepy or half torpid, to digest their food. These birds do not carry food to their young in their claws, but disgorge it from the crop.

Vultures are of great value as scavengers, especially in hot regions. Vulture stomach acid is exceptionally corrosive, allowing them to safely digest putrid carcasses infected with Botulinum toxin, hog cholera, and anthrax bacteria that would be lethal to other scavengers. New World vultures often vomit when threatened or approached. Contrary to some accounts, they do not "projectile vomit" on their attacker as a deliberate defense, but it does lighten their stomach load to make take-off easier, and the vomited meal residue may distract a predator, allowing the bird to escape.

Vultures in south Asia, mainly in India and Nepal, have declined dramatically since the early 1990s. It has been found that this decline was caused by residues of the veterinary drug Diclofenac in animal carcasses. The government of India has taken very late cognizance of this fact and has banned the drug for animals. However, it may take decades for vultures to come back to their earlier population level. The same problem is also seen in Nepal where government has taken some late steps to conserve remaining vultures.