Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
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Squirrels will sometimes adopt orphaned baby squirrels that they’re related to.
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Sergeant Stubby was the only war dog to be promoted to sergeant through combat in WWI. He saved his regiment from surprise mustard gas attacks, found and comforted the wounded, and even once caught a German spy by the seat of his pants, holding him there until American Soldiers found him.
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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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Dolphins have names for one another.
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A zoo in China gave a gay penguin couple the opportunity to raise a chick.
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