Sharks have been on the planet longer than trees.
14
It has been scientifically proven that stroking a cat can lower one's blood pressure!
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When cats are happy, they may squeeze their eyes shut.
10
Penguins have a gland above their eye that turns saltwater into freshwater.
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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
George was the world's largest dog who weighed 233 pounds, stood at 43 inches tall from paw to shoulder, and ate 180 pounds of food a month.
7