Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
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When a male gentoo penguin "falls in love" with a female penguin, he searches the entire beach to find the perfect pebble to present to her.
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A couple had their wedding rings engraved with a waveform of their own voices saying "I do."
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The desire to squeeze and hug cute things comes from the same place in your brain as aggression.
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When dragonflies mate, their tails form a love heart.
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Meysi is one of the world's smallest dogs, measuring in at just 7cm tall, 12cm long, and weighing a meagre 250 grams (only slightly heavier than a hamster!)
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