A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
Dolphins can rapidly heal from extreme injuries, such as shark bites, and regenerate their original body shape.
19
The head of a jellyfish is called the "Bell."
6
The octopus does not have a blind spot.
273
When a male gentoo penguin "falls in love" with a female penguin, he searches the entire beach to find the perfect pebble to present to her.
25
Squirrels forget where they hide about half of their nuts.
698
Tigers can see 6 times better at night than humans.
305