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FELOPZDDEFPOTEC t1_ja9gmin wrote

Reply to comment by Itsshrovetuesday in A Recent Situation Involving A Mean Piece Of Grass Requires Her to Wear Her Doggles When She's Playing Frisbee. She Doesn't Seem To Mind. Frisbee Is Life. by Itsshrovetuesday

TIL that dogs and cats have nictitating membranes??? I have known about third eyelids in other creatures since I was like 8 and obsessed with the Crocodile Hunter, but never knew that cats and dogs have them.

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Abnmlguru t1_ja9l89o wrote

Fun fact: The pink triangle that most people think is your tear duct in your eye is left over from when people had nictitating membranes. The actual tear duct isn't really visible to the naked eye.

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Itsshrovetuesday OP t1_ja9hmto wrote

yep! it's especially noticeable in dogs that have the condition known as "cherry eye". That happens when the 3rd lid prolapses (which can be repaired surgically).

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