There are no penguins in the North Pole.
56
Dolphins have names for one another.
18
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Jaguars frequently get high by eating hallucinogenic roots, which also increases their senses for hunting.
6
When it comes time to give birth, the female shark loses her appetite so she won't be tempted to eat her own pups.
280
Cats and dogs can hear ultrasound.
350