Sheep, goats, octopuses, and toads have rectangular pupils.
7
Bats sleep 18-20 hours per day.
5
Parrotfish make themselves a kind of mucus 'sleeping bag' which masks their smell from predators and keeps parasites away.
4
The Basenji dog is the only dog that is not able to bark.
4
Christmas Island has bridges for crabs to stop them getting run over during the mass migration.
9
Penguins have a gland above their eye that turns saltwater into freshwater.
12