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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Sheep, goats, octopuses, and toads have rectangular pupils.
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The most expensive cow in the world was sold in 2009 for $1.2 million.
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Mahatma Gandhi used to travel with his goat so that he could have fresh milk.
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Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
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The ancestor of all domestic cats is the African Wild Cat which still exists today.
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