Tigers can see 6 times better at night than humans.
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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.
16
Dolphins sometimes have fun by blowing bubbles and creating rings of air underwater, which they then swim through.
17
An alligator can go through 2,000 to 3,000 teeth in a lifetime.
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