Sifrhippus was a species of horse about the size of an average duck and roamed North America 56 million years ago.
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Whales and dolphins can't taste anything other than salt.
11
Gorillas can catch human colds and other illnesses.
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The ancestor of all domestic cats is the African Wild Cat which still exists today.
12
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
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12