A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
A banana slug can be 6-8 inches and their erect penis can be just as long. Also, their penises emerge from their heads. After sex, banana slugs eat each others penises.
17
Sifrhippus was a species of horse about the size of an average duck and roamed North America 56 million years ago.
2
Macaques monkeys in Japan learned to steal purses and wallets, take out the coins, and use them to buy drinks and snacks from vending machines.
26
Squirrels forget where they hide about half of their nuts.
698
In 2011, a male tiger in India adopted a litter of orphaned cubs, taking on the role of ‘mother’. Wildlife officials say such behavior had never been observed before.
9
A zoo in China gave a gay penguin couple the opportunity to raise a chick.
11