Sunday, March 15, 2015

Vocabulary word for the day...

nic·ti·tat·ing mem·brane
ˌniktətādiNG ˈmembrān/
noun
ZOOLOGY
  1. a whitish or translucent membrane that forms an inner eyelid in birds, reptiles, and some mammals. It can be drawn across the eye to protect it from dust and keep it moist

This juvenile Red-tailed Hawk is using her nictitating membrane to protect her left eye. 
It's a zombie hawk winking! No! 
Up until today I knew that birds had this, but I had no idea that it's called a nictitating membrane. Cats and sharks also have this membrane. A little quick research turned up that most birds can still see through the membrane and that vultures use theirs in the same fashion as sharks do, that is to protect the eye when plunge their heads into a carcass.


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