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There's a reason that you love those sacred snuggle sessions so much. Every time you and your partner cuddle, it triggers the release of happiness hormone oxytocin to increase your mood and wellbeing. This phenomenon is so well-documented, in fact, that oxytocin is often referred to as the "cuddling hormone," or the "love hormone."

Humans aren't the only species in the animal kingdom that practice monogamous relationships. Out in the wild, beavers, otters, wolves, seahorses, and barn owls are just some of the 25 Adorable Animals That Mate for Life.