Sandy, an African Penguin, has been in 'love' with her keeper at the Nuremburg zoo since 1996.
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One litter of kittens can be produced by more than one father.
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When cats are happy, they may squeeze their eyes shut.
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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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A new born kangaroo is small enough to fit in a spoon!
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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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