The first known contraceptive was crocodile dung, used by Egyptians in 2000 B.C.
79
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
6
Condoms were originally made of animal intestines or linen.
347
The reindeer is the only mammal that can see UV light.
17
Honeypot ants are a unique insect that use their own bodies as living storage pots of honey.
4