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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Tigers can see 6 times better at night than humans.
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Ants have tiny magnetic compasses in their antennae which help them navigate.
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Sheep, goats, octopuses, and toads have rectangular pupils.
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