An owl is any of about 174 species of solitary nocturnal birds of prey in the order Strigiformes. Owls mostly hunt small mammals, insects, and other birds, though a few species specialize in hunting fish. They are found on all the Earth's land except for Antarctica, most of Greenland, and some remote islands.
Owls have large forward-facing eyes and ears, a hawk-like beak, and a conspicuous circle of feathers around each eye called the facial disk. Although owls have binocular vision, their large eyes are fixed in their sockets, and they must turn their entire heads to change views.
Owls are far-sighted, and are unable to clearly see anything within a few inches of their eyes. However, their vision, particularly in low light, is excellent.
Many owls can also hunt by sound in total darkness. The facial disc helps to funnel the sound of rodents to their ears, which for better directional location are widely spaced and in some species placed asymmetrically.