The Basenji dog is the only dog that is not able to bark.
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Penguins have a gland above their eye that turns saltwater into freshwater.
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There's a rare breed of pig that looks like a sheep.
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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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Early American humans hunted car-size armadillos and used their shells for houses.
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