Cows can sleep standing up, but they can only dream lying down.
745
When a male gentoo penguin "falls in love" with a female penguin, he searches the entire beach to find the perfect pebble to present to her.
25
Jumping fleas can accelerate 50 times faster than the space shuttle.
218
When dragonflies mate, their tails form a love heart.
22
Only 3% of bird species have penises.
0
One in three dog owners say they have talked to their pets on the phone.
427