Sloths take two weeks to digest their food.
243
Christmas Island has bridges for crabs to stop them getting run over during the mass migration.
9
Cats are one of the only animals to domesticate themselves and approach humans on their own terms.
20
It has been estimated that a bite from a grizzly bear can crush a bowling ball.
11
Parrotfish make themselves a kind of mucus 'sleeping bag' which masks their smell from predators and keeps parasites away.
4