A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Christmas Island has bridges for crabs to stop them getting run over during the mass migration.
9
It has been estimated that a bite from a grizzly bear can crush a bowling ball.
11
A group of unicorns is called a blessing.
304
Mosquitoes prefer certain blood types, and people with the “O” blood type are more likely to get bitten.
12
The seahorse is the only fish to have a neck.
12
The reindeer is the only mammal that can see UV light.
17
A dog's naked behind leaves absolutely no bacteria when pressed against carpet.
250