Dolphins sometimes have fun by blowing bubbles and creating rings of air underwater, which they then swim through.
17
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
Dogs sometimes fake being sick to get attention.
26
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
The oldest known animal in the world was 'Ming' the 405 year old clam, discovered in 2007.
492