Bats sleep 18-20 hours per day.
5
A koi fish, named "Hanako", was owned by several individuals over many years and lived to be 226 years old, dying in 1977.
6
In Australia, there are spiders big enough to eat snakes.
20
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
Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
6
The first known contraceptive was crocodile dung, used by Egyptians in 2000 B.C.
79