Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
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Dolphins can rapidly heal from extreme injuries, such as shark bites, and regenerate their original body shape.
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Sloths take two weeks to digest their food.
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An Indian man known as "Snake Manu" can put small snakes, including deadly cobras, into his mouth and pass them out through his nose.
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It has been calculated that a single breath from a mature blue whale can inflate up to 2,000 balloons.
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Dolphins have names for one another.
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Baks the blind boxer has a seeing eye goose named Buttons; a four-year-old goose who leads the pup around everywhere either by hanging onto him with her neck, or by honking to tell him which way to go.
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