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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Mosquitoes prefer certain blood types, and people with the “O” blood type are more likely to get bitten.
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In 1949, an official boxing match between a bear and a man was held. The bear won.
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The sound of a tiger's roar can travel a distance of up to 2 miles (~3 km).
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It has been estimated that a bite from a grizzly bear can crush a bowling ball.
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