How can birds keep their eyes moist during flight?

Question

Mammals have an upper lid and small mass of tissue in the upper corner known as nictitating membrane. This helps keep the eyes clean; birds can moisten their eyes in flight using this membrane without blinking. How does this work?

score 0 · Answer 1 · edited Oct 29 '15 at 00:58

0

Because the nictitating membrane secretes a fluid that is resistant to evaporation. Therefore, birds need not blink their eyes during flight.

edited Oct 29 '15 at 00:58

L.B.

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answered Oct 28 '15 at 12:34

ama

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Please do add some solid references. – L.B. Oct 28 '15 at 20:09

How can birds keep their eyes moist during flight?

1 Answers1