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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Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
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Dolphins have names for one another.
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Sea otters hold hands while sleeping so they don’t drift away from each other.
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When cats are happy, they may squeeze their eyes shut.
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A puppy is born blind, deaf, and toothless.
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