Dire wolves actually existed, living up to 10,000 years ago before going extinct.
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When dragonflies mate, their tails form a love heart.
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Nervous dogs wag their tails to the left, and happy dogs to the right (from the dog’s point of view) – and fellow canines pick up on this lop-sided tail language.
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When Washoe, the first chimp to use sign language, was told that her caretaker's baby had died, she signed "CRY."
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