Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
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
Bats sleep 18-20 hours per day.
5
Some lizards, in which the tail is a major storage organ for accumulating reserves, will return to a dropped tail after the threat has passed, and will eat it to recover part of the sacrificed supplies.
13
Jellyfish as a species are actually older than dinosaurs and sharks.
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