Vulture comes under Carion i believe which crows are the less abled members of and hawks come under same type i believe
Carrion (from the Latin caro, meaning meat) refers to the carcass of a dead animal. Carrion is an important food source for large carnivores and omnivores in most ecosystems. Examples of carrion-eaters, or scavengers, include Hyenas, Vultures, Virginia Opossum, Tasmanian Devils, Black Bears, Komodo Dragons, Bald Eagles, Raccoons and Blue-tongued lizards. Many invertebrates, such as worms and carrion beetles (family Silphidae) also eat carrion and play an important role in recycling animal remains.
Carrion begins to decay the moment of the animal's death, and it will increasingly attract insects and breed bacteria. Not long after the animal has died, its body will begin to exude a foul odour caused by the presence of bacteria and the emission of cadaverine and putrescine. Some plants and fungi smell like decomposing carrion and attract insects that aid in reproduction. Plants that exhibit this behavior are known as carrion flowers. Stinkhorn mushrooms are examples of fungi with this characteristic.
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oops hawks different but surely as digest the whole animal if small bird must be effected the same way
http://en.wikipedia.org/wiki/Hawk