The owls are part of the family Strigiformes, which include about 200 birds of prey. Most are solitary, and nocturnal, except for some like the Burrowing owl. Owls hunt mostly small mammals, insects and other birds, though some specialize in hunting fish. Owls are found in all regions of the Earth except Antarctica, most of Greenland, and some remote islands. Living owls are divided into two families: the typical owls, (Strigidae) and the barn-owls, (Tytonidae).