Isn't this a trait that only appears with crocodiles and alligators?
>>154417497
It's a trait that makes my dick appear
>>154417497
It's a trait reptiles have.
Go to /an/ for shit like this, though they might tell you to fuck off for knowing nothing.
>>154417579
I can already imagine that knowing 4chin culture
>>154417497
You should go outside every now and then.
>>154417497
How about going to Google and typing in "Reptile eyes"?
Didn't you watch nature documentaries when you went to school?
>>154417497
We actually have those, but they're tiny and vestigial.
>>154417497
You forgot our reptilian overlord Barack Obama.
Nictitating membranes are found across all main clades of Amniota, including some mammals, plus birds and dinosaurs; it's also a common vestigial trait among these groups. It evolved in early amniotes as the moved to live in drier conditions than their semiaquatic ancestors.
>>154419268
Even dogs and cats have them.