A lion in the wild usually makes no more than twenty kills a year.
186
Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
6
When cats are happy, they may squeeze their eyes shut.
10
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
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12