Only 3% of bird species have penises.
0
A giraffe's kick is so powerful that it can decapitate a lion.
216
Christmas Island has bridges for crabs to stop them getting run over during the mass migration.
9
Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
6
Sloths take two weeks to digest their food.
243