Only 3% of bird species have penises.
0
Sloths take two weeks to digest their food.
243
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
Cows can sleep standing up, but they can only dream lying down.
745
The world’s largest frog, the Goliath frog, can grow over 13 inches in length and can jump up to 10 feet in a single bound.
8
When a drone bee mates with a queen, its ejaculation is so powerful that it can even be heard by the human ear.
5