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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During World War 1, starving wolves amassed in such great numbers that Germans and Russians had a temporary cease fire to fight off the wolf attacks.
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A scorpion can hold its breath for up to 6 days.
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The colossal squid has the largest eyes in the world.
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