Sifrhippus was a species of horse about the size of an average duck and roamed North America 56 million years ago.
2
Squirrels forget where they hide about half of their nuts.
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When Washoe, the first chimp to use sign language, was told that her caretaker's baby had died, she signed "CRY."
20
Squirrels will sometimes adopt orphaned baby squirrels that they’re related to.
12
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
Meysi is one of the world's smallest dogs, measuring in at just 7cm tall, 12cm long, and weighing a meagre 250 grams (only slightly heavier than a hamster!)
11
Domestic pigs average a top speed of about 11 miles per hour.
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