Sandy, an African Penguin, has been in 'love' with her keeper at the Nuremburg zoo since 1996.
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A zoo in China gave a gay penguin couple the opportunity to raise a chick.
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When dragonflies mate, their tails form a love heart.
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When cats are happy, they may squeeze their eyes shut.
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Holding hands with someone you love can alleviate physical pain as well as stress and fear.
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