A pack hunter or social predator is a predator belonging to the animal kingdom, which has evolved to hunt its prey by working together with other members of its species. Normally animals hunting in this way are closely related, and with the exceptions of humans and chimpanzees where only males normally hunt, all individuals in a family group will contribute to hunting. The most commonly known pack hunter is the gray wolf, the closest wild relative of all breeds of domesticated dog. Humans and their closest-living relatives chimpanzees are themselves pack hunters even without aid of other species. Other pack hunting mammals include dolphins, lions, dwarf and banded mongooses and spotted hyenas. A number of avian social predators exist, including the Harris's hawk, butcherbirds, three of fou