Why Do Birds' Eyes Change Colors?

In some species of hawks, gulls, and other avians, it marks an important transition into adulthood.

What Feathers Tell You About Your Parrot's Health

Birds see colors invisible to humans - Futurity

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Eamon C. Corbett on X: Why do birds have different eye colors? The short answer is we don't know. The long answer is in our new review article, up now as a

Is it theoretically possible for a bird or a mammal to change colours (similar to chameleons)? - Quora

Cooper's Hawk Eye Colors

How Does A Bird's Vision Work?

How reindeer eyes change colour in winter to help them see in the dark

Wild hummingbirds see a broad range of colors humans can only imagine