When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
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Sheep, goats, octopuses, and toads have rectangular pupils.
7
Our eyes are always the same size from birth, but our nose and ears never stop growing.
266
The colossal squid has the largest eyes in the world.
4
Tigers can see 6 times better at night than humans.
305
Most of us have microscopic, worm like mites named Demodex that live in our eyelashes and have claws and a mouth.
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All humans have the ability to see ultraviolet light, but it is passively filtered out by the eye's lens. People who undergo surgery to remove the lens can detect ultraviolet light.
21