Big-eyed birds are a type of bird that have large eyes relative to their head size. Two examples of big-eyed birds are owls and emus. Owls are nocturnal birds of prey with a distinct facial disc and ear tufts. They are found in many parts of the world and feed on small mammals, insects, and other birds. Emus are large flightless birds native to Australia. They have long necks and legs and can reach up to 6 feet tall. They are omnivorous and feed on plants, insects, and small animals.