A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
The ancestor of all domestic cats is the African Wild Cat which still exists today.
12
The largest earthworm on record was found in South Africa and measured 22 feet.
151
The two oldest cats on record lived to 38 and 34 years old, both were owned by the same owner and lived off a diet of bacon, eggs, broccoli and coffee.
12
During World War 1, starving wolves amassed in such great numbers that Germans and Russians had a temporary cease fire to fight off the wolf attacks.
45