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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Sandy, an African Penguin, has been in 'love' with her keeper at the Nuremburg zoo since 1996.
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When cats are happy, they may squeeze their eyes shut.
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Tigers, leopards, and jaguars love "Calvin Klein's Obsession for Men". The scent is used to attract animals to cameras in the wilderness, and was even a turn on for one pair of Jaguars who were subject to it.
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