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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A group of kittens is called a "kindle".
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In Australia, there are spiders big enough to eat snakes.
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Domestic pigs average a top speed of about 11 miles per hour.
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A domestic cat can sprint at about 31 miles per hour.
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It has been calculated that a single breath from a mature blue whale can inflate up to 2,000 balloons.
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The Lion's Mane Jellyfish is the largest jellyfish in the world. They have been swimming in arctic waters since before the dinosaurs (over 650 million years ago).
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