Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
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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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There was a bear called Wojtek who was adopted by Polish soldiers during WW2. It carried ammunition, wrestled with soldiers, and drank beer.
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The largest breed of rabbit is the Flemish Giant.
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Dolphins have names for one another.
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Giant Anteaters' front legs look like a panda.
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