A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Dolphins can rapidly heal from extreme injuries, such as shark bites, and regenerate their original body shape.
19
Cats sleep for 70% of their lives.
8
Sharks, like other fish, have their reproductive organs in their chests.
248
Jumping fleas can accelerate 50 times faster than the space shuttle.
218
Ants tend to survive in a microwave because they find the coolest spot and wait!
17