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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It's possible to train your cat to use the toilet as a litter box and even flush afterwards.
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Cats recognise the voice of their owner, but never evolved to care.
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The oldest known animal in the world was 'Ming' the 405 year old clam, discovered in 2007.
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It has been calculated that a single breath from a mature blue whale can inflate up to 2,000 balloons.
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Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
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