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Have you ever seen an eagle blink? (Original Post)
MLAA
Feb 2021
OP
Demovictory9
(32,475 posts)1. Cool
secondwind
(16,903 posts)2. Love DU! Always learn something when I visit the page.
Education never stops
Fla Dem
(23,765 posts)5. Wonderful video, but Eagles are not unique in this eye movement.
Birds rarely blink (with the exception of owls, parrots, ostriches, and a few others) and close their eyes for sleeping by raising the lower lids. Usually unseen, however, is the third eyelid (nictitating membrane), located beneath the upper and lower lids, which moves horizontally across the eyeball. The movement of this eyelid across the eye functions like our blinking and serves to keep the eye moist. In some diving birds, the nictitating membrane has a transparent window that permits vision underwater while the membrane is closed.
https://www.birdwatchingdaily.com/news/science/why-birds-eyes-are-so-large-and-how-they-function/#:~:text=Do%20birds%20blink%3F,moves%20horizontally%20across%20the%20eyeball.
https://www.birdwatchingdaily.com/news/science/why-birds-eyes-are-so-large-and-how-they-function/#:~:text=Do%20birds%20blink%3F,moves%20horizontally%20across%20the%20eyeball.
BobTheSubgenius
(11,571 posts)6. That reminded me of an alligator's blink.
The membrane did, anyway. Thank you, MLAA! That was unexpected and cool!
MLAA
(17,332 posts)11. Alligators freak me out. Did you see this massive one?
Politicub
(12,165 posts)7. Will keep this on file for the next time an eagle challenges me to
a staring contest.
MLAA
(17,332 posts)9. I'll put my money on you politicub 😬
Bayard
(22,163 posts)8. The third eyelid
All kind of animals have them. Humans are the weird ones without.
Xipe Totec
(43,890 posts)12. They nictitate nt