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The Eye of a Red-eyed Tree Frog at Rest
(discuss.tchncs.de)
An impressive feature is their bright red colored eyes with vertical slits. They do not have a true eyelid, but rather a nictitating membrane that allows light to enter the eye so that they will awaken when predators are approaching.
https://en.wikipedia.org/wiki/Agalychnis_callidryas#Description
no doubt. that doodad on the hehaw is amazing.