Cows can sleep standing up, but they can only dream lying down.
745
Mosquitoes don't just bite you, they also pee on you.
11
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
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
One reason that kittens sleep so much is because a growth hormone is released only during sleep.
212
Elephants are terrified of Bees and actually have a special, distinct vocalization for “Run away the Bees are angry”
49
The reindeer is the only mammal that can see UV light.
17