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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Sandy, an African Penguin, has been in 'love' with her keeper at the Nuremburg zoo since 1996.
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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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Cuddling (or other ‘love’ acts) helps to heal physical wounds faster due to the release of Oxytocin which is proven to reduce swelling.
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Raj from the Big Bang Theory is married to Miss India.
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Wearing red increases attraction.
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A Korean man called Lee Jin-gyu fell in love with his large, huggable pillow and married it.
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