A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
There's a young hippo and a 130+ year old tortoise in a Kenyan wildlife preserve who are best friends and they even sleep and play together.
40
A zoo in China gave a gay penguin couple the opportunity to raise a chick.
11
There's a rare breed of pig that looks like a sheep.
14
Honeypot ants are a unique insect that use their own bodies as living storage pots of honey.
4
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
Cats sleep for 70% of their lives.
8