A dragonfly has a lifespan of 24 hours.
24
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
The head of a jellyfish is called the "Bell."
6
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
The quills of a porcupine are soft when they are born.
90
There wasn't a single pony in the Pony Express, just horses!
57
The Giant South African Earthworm can grow up to 22 feet long and 1 inch in thick.
37
Armadillos can get leprosy.
13