Do birds have eyelids?

Andrew Kitchener gives us the answer in the blink of an eye

8,665 views comments

Do birds have eyelids?

Birds do have upper and lower eyelids that can close up to protect their eyes and prevent them from drying out. Many birds also have hair-like feather ,that look just like eyelashes. Unlike humans, however, they have an extra or third eyelid called the ‘nictitating membrane’, which helps keep the eyes clean by removing dust and other things that get into their eyes. The nictitating membrane closes across the eye from its inner corner, moving sideways to the outer corner.

Unlike the main eyelids, the nictitating membrane is semi-transparent so that birds can continue to see while flying or feeding, which could be important in the split seconds that they may have for catching prey or escaping predators. Diving birds, such as cormorants and some ducks, even have small transparent windows in their nictitating membranes so that they can see while swimming underwater.

Andrew Kitchener, Principal Curator of Vertebrate Biology, National Museums Scotland

Tags: , , , ,

  • Juanda

    I swam in the Dead Sea and got fascinated with the rocks I encounterd. So I began collecting
    them as I floated, placing my chosen ones on my lap as I floated to shore. I was impressed
    that I continued to float regardless of the weight on me. It was fun experiencing the buoyancy
    and being unable to sink no matter how much I tried.

    There is a Mono Lake the the state of Nevada, USA that I experienced as a little kid that is
    also more salty than the ocean. The buoyancy is not as extreme as that of the Dead Sea, and
    it does have living organisms in it.

    I have fond memories of both experiences