A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
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Cats recognise the voice of their owner, but never evolved to care.
22
In 1949, an official boxing match between a bear and a man was held. The bear won.
41
Squirrels will sometimes adopt orphaned baby squirrels that they’re related to.
12
A newborn Chinese water deer is so small, it can (almost) be held in the palm of a hand.
13
In 1955, the citizens of São Paulo were so upset with their government that they elected a rhinoceros named Cacareco (meaning rubbish) to the city council in protest, with over 100,000 votes.
18