Sloths take two weeks to digest their food.
243
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
The sound of a tiger's roar can travel a distance of up to 2 miles (~3 km).
255
Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
6
Dolphins sometimes have fun by blowing bubbles and creating rings of air underwater, which they then swim through.
17