Can an eagle see a mouse from two miles away?

The common name for several huge birds of prey in the Accipitridae family is eagle. Eagles are classified into various genera, some of which are closely related. The majority of the 68 eagle species are found in Eurasia and Africa. Eagles are not a natural group, but rather any type of bird of prey large enough to hunt huge (50 cm long or more overall) animals. The eyes of eagles are highly strong. The martial eagle, whose eyes are more than twice the size of the human eye, is said to have visual acuity up to eight times that of humans. This sharp vision allows eagles to see possible prey from a great distance.

This sharp vision is due mostly to their exceptionally big pupils, which guarantee little diffraction (scattering) of incoming light. All known species of eagles have a bigger female than a male. The phrase "eagle eyes" comes from the golden eagle, which has amazing vision and can notice a rabbit or mouse from 2 miles (3.2 kilometers) away. For comparison, a person could not see the same rabbit from a quarter-mile (0.40 kilometers) away. An eagle's eyes are developed for clear vision in daylight, from early morning light to early evening light. The pupil of an eagle's eye is too small to see at night. The bony ridge above an eagle's eyes helps protect them from sunlight and assist in effective hunting.