Early American humans hunted car-size armadillos and used their shells for houses.
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Sharks have been on the planet longer than trees.
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Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
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In Australia, there are spiders big enough to eat snakes.
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An average cat has 1-8 kittens per litter and can have 2-3 litters per year. During her productive life, one female cat could have more than 100 kittens. A single pair of cats and their kittens can produce as many as 420,000 kittens in just 7 years.
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