The most expensive dog in the world is the Tibetan Mastiff; worth $1.5 million.
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Urechis unicinctus is a species of marine spoon worm that is widely referred to as the ‘penis fish’.
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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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The ancestor of all domestic cats is the African Wild Cat which still exists today.
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