A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Honeypot ants are a unique insect that use their own bodies as living storage pots of honey.
4
Whales and dolphins can't taste anything other than salt.
11
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
The head of a jellyfish is called the "Bell."
6