When cats are happy, they may squeeze their eyes shut.
10
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
Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
6
There's a lizard known as the 'Jesus Lizard' that can run across water.
11
A 42-foot sperm whale has about 7 tons of oil in it.
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