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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The elephant brain weighs about 6,000g.
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Alligator snapping turtles can live for over 150 years. Scientists know this because some of the turtles had musket balls in their stomachs.
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Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
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The sound of a tiger's roar can travel a distance of up to 2 miles (~3 km).
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A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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