The first known contraceptive was crocodile dung, used by Egyptians in 2000 B.C.
79
Cats and dogs can hear ultrasound.
350
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
The colossal squid has the largest eyes in the world.
4
The sound of a tiger's roar can travel a distance of up to 2 miles (~3 km).
255