Parents receive 1 out of every 5 Valentines.
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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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Falling in love raises levels of nerve growth in a person's brain for about a year and can improve their memory.
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In 2012, a Chinese man named Xiao Fan had a dress made out of 9,999 red roses for his girlfriend and then proposed - 9 in China means forever
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Sea otters hold hands while sleeping so they don’t drift away from each other.
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Brain scans show that people who view photos of a beloved experience an activation of the caudate - the part of the brain involving cravings.
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