Sea otters hold hands while sleeping so they don’t drift away from each other.
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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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Erotomania is a type of delusion in which the person believes another person is in love with him/her.
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In medieval Italy, if a man was caught kissing a woman in public, he had to marry her whether he liked it or not.
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When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
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Two in five people in the world marry their first love.
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In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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