red-headed vulture, sarcogyps calvus, thailand

birds of thailand asia vultures wildlife nature wild raptor raptors bird prey accipitriformes accipitridae gyps himalayensis predator natural habitat wintering migratory himalayas near threatened tropical in carcass grass summer trees hunting scavengers wings fly beak bill red-headed vulture sarcogyps calvus critically endangered asian king indian black pondicherry huai kha kaeng sanctuary