The reindeer is the only mammal that can see UV light.
17
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
A dairy cow can produce more milk when listening to music.
446
A 42-foot sperm whale has about 7 tons of oil in it.
209
Tigers, leopards, and jaguars love "Calvin Klein's Obsession for Men". The scent is used to attract animals to cameras in the wilderness, and was even a turn on for one pair of Jaguars who were subject to it.
17
There is a sea snail that wears a suit of iron plated armor. It is the only known animal to use iron sulphide as skeletal material.
9