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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The head of a jellyfish is called the "Bell."
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The most expensive cow in the world was sold in 2009 for $1.2 million.
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Some lizards, in which the tail is a major storage organ for accumulating reserves, will return to a dropped tail after the threat has passed, and will eat it to recover part of the sacrificed supplies.
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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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Crows living in some urban areas drop nuts into traffic to let the passing cars crush them, then they wait for the red lights to stop the traffic so they can grab and eat it.
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Dogs sometimes fake being sick to get attention.
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