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Re: Mei's head version 2
Quoting Michael Schmidt <firstname.lastname@example.org>:
> having had a moluccan cockatoo for several years, she always sleeps with her
> eyes closed. I'm not sure if this is the case for other birds, but she also
> has a very thin membrane covering her eye that is almost like a second
> eyelid that activates on a more delicate basis than her regular one.
This is called a nictitating membrane. Off the top of my head, all the birds I
can think of have one, as well as crocodilians, at least some lizards, some
mammals (e.g. cats), and some sharks.
Department of Linguistics
University of Michigan