There are more than 60 different species of eagle.
Eagles are different from many other birds of prey mainly by their larger size,
more powerful build, and heavier head and beak. Most eagles are larger than any
other raptors apart from vultures.
Eagles have unusual eyes. They are very large in proportion to their heads and
have extremely large pupils. Eagles' eyes have a million light-sensitive cells
per square mm of retina, five times more than a human's 200,000. While humans
see just three basic colours, eagles see five. These adaptations gives eagles
extremely keen eyesight and enable them to spot even well-camouflaged potential
prey from a very long distance. In fact the eagles' vision is among the sharpest
of any animal and studies suggest that some eagles can spot an animal the size of
a rabbit up to two miles away!
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