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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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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Ants have tiny magnetic compasses in their antennae which help them navigate.
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There's a rare breed of pig that looks like a sheep.
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The ancestor of all domestic cats is the African Wild Cat which still exists today.
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In 2011, a male tiger in India adopted a litter of orphaned cubs, taking on the role of ‘mother’. Wildlife officials say such behavior had never been observed before.
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