sixpenceee: The Eye of a Tree Frog. The film covering his eye is a nictating membrane that&rsqu
sixpenceee: The Eye of a Tree Frog. The film covering his eye is a nictating membrane that’s effectively an extension of its lower eyelid. It keeps his eye moist while he’s asleep. Because it lets in light, the frog can still detect predators while asleep. (Source) -- source link