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What (who) is nictitating membrane - definition
![medial]] [[canthus]]](https://commons.wikimedia.org/wiki/Special:FilePath/Bird blink-edit.jpg?width=200 "medial]] [[canthus]]")
![[[Common goldeneye]] showing the transparent nictitating membrane characteristic of diving animals](https://commons.wikimedia.org/wiki/Special:FilePath/Common Goldeneye showing nictitating membrane - crop.JPG?width=200 "[[Common goldeneye]] showing the transparent nictitating membrane characteristic of diving animals")
![The [[plica semilunaris of conjunctiva]] is a vestigial remnant of a nictitating membrane in humans.](https://commons.wikimedia.org/wiki/Special:FilePath/Gray892.png?width=200 "The [[plica semilunaris of conjunctiva]] is a vestigial remnant of a nictitating membrane in humans.")
![The nictitating membrane (mid-blink) of a [[bald eagle]]](https://commons.wikimedia.org/wiki/Special:FilePath/Haliaeetus leucocephalus LC0198.jpg?width=200 "The nictitating membrane (mid-blink) of a [[bald eagle]]")
![The nictitating membrane (completely closed) of a [[black crowned crane]], right eye](https://commons.wikimedia.org/wiki/Special:FilePath/Nictitating membrane - Nickhaut - Membrana nittitante - (Balearica pavonina - Weltvogelpark 2013).jpg?width=200 "The nictitating membrane (completely closed) of a [[black crowned crane]], right eye")
Wikipedia
The nictitating membrane (from Latin nictare, to blink) is a transparent or translucent third eyelid present in some animals that can be drawn across the eye from the medial canthus to protect and moisten it while maintaining vision. All Anura(tailless amphibians), and some reptiles, birds, and sharks have full nictitating membranes; in many mammals, a small, vestigial portion of the nictitating membrane remains in the corner of the eye. Some mammals, such as cats, camels, polar bears, seals and aardvarks, have full nictitating membranes. Often called a third eyelid or haw, it may be referred to in scientific terminology as the plica semilunaris, membrana nictitans, or palpebra tertia.
