Dire wolves actually existed, living up to 10,000 years ago before going extinct.
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The Platypus used to be considered a myth like Bigfoot and the Yeti.
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Jellyfish as a species are actually older than dinosaurs and sharks.
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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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