sat watching one, waiting for it to blink
2007-03-10 01:36:26 · 4 answers · asked by Anonymous in Pets ➔ Birds
Birds have three eyelids-an outer, upper and lower lid and the third eyelid just inside the others. The third eyelid (membrance nictatans) performs the job of cleaning and moistening the cornea. The inner surface is covered with cells which possess brushlike processes, so that the cornea is painted with tears at every blink. Like a windshield wiper, it cleans the undersurface of the eyelid on the return journey of each sweep. Pet birds blink with their eyelid 30 - 60 times a minute, and usually so swiftly as to be undetected. A large gland under the third eyelid furnishes much of the lubrication for the eye.
2007-03-10 02:48:17 · answer #1 · answered by Dreamweaver 4 · 0⤊ 0⤋
All birds have eyelids but because they have a clear 3rd eyelid that they use to clean their eyes you may not notice them blinking.
2007-03-10 21:03:02 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Birds have eyelids but do not blink. They close them only for sleeping. Staring down a bird is not recommended.
2007-03-10 09:43:31 · answer #3 · answered by Dreamer 7 · 1⤊ 1⤋
they dont blink..but only use them for sleeping .
2007-03-10 11:53:11 · answer #4 · answered by grumpcookie 6 · 0⤊ 1⤋