Eagles have excellent eyesight and can spot prey from a great distance.

The longer version

Acuity depends on how tightly receptor cells are packed and on a deep pit in the retina that acts like a magnifying centre. Eagles pack cones far denser than a human retina does and have two such pits, giving a sharp central image plus a second zone for sideways detail while scanning.

The eye is large relative to the head, and a bony ring holds it rigid so the image stays steady. Many raptors also see ultraviolet, which helps them follow urine trails left by small mammals on the ground. The real advantage is resolving fine movement from a high perch rather than seeing across enormous distances.

Where this entry sits

Here you will find feathered trivia about flight, migration, nests, eggs, and the songs birds sing. Expect short surprising facts on penguins, owls, hummingbirds, and other familiar birds from gardens, forests, wetlands, and distant coastlines. The full list sits on the Birds page, where every entry is listed in order.