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.
16
Sharks, like other fish, have their reproductive organs in their chests.
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Cats are one of the only animals to domesticate themselves and approach humans on their own terms.
20
Cats sleep for 70% of their lives.
8
Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
6
Honeypot ants are a unique insect that use their own bodies as living storage pots of honey.
4
Rattlesnake mating sessions have been known to last more than 22 hours.
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