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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Dolphins have names for one another.
18
Some British police cars carry a teddy bear to console children after an accident.
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Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
13
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!)
11
Ten seconds of hugging a day increases levels of oxytocin, which can reduce blood pressure, thus cutting the risk of heart disease.
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