The presence of the tapetum can be observed at night when a pair of glowing eyes reflects back a flashlight or some other light source. (Interestingly, different animals have different color ...

Watch a pond light up with glowing alligator eyes. There's so many of them, and they're bellowing ferociously.

Creatures that sleep during the day and are active at night are known as nocturnal ... The snout, ears, and eyes of these animals can absorb ultraviolet light and project it as blue light.

Harrison gazed upon these wild animals, and he says it was as if his eyes had been blistered shut and were suddenly opened as he witnessed these mammals moving in such profound harmony with their ...