The world's smartest pig, owned by a mathematics teacher in Madison, WI, memorized the multiplication tables up to 12.
264
Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
6
A duck's quack doesn't echo, and no one knows why.
173
A group of kangaroos is called a mob.
28
Ants make up 1/10 of the total world animal tissue. The total biomass of all the ants on Earth is about equal to the total biomass of all the people.
85
Tigers can see 6 times better at night than humans.
305