When cats are happy, they may squeeze their eyes shut.
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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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Raj from the Big Bang Theory is married to Miss India.
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A group of kittens is called a "kindle".
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A group of pugs is called a grumble.
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Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
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