Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
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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.
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Alligators can live up to 100 years.
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A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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Nervous dogs wag their tails to the left, and happy dogs to the right (from the dog’s point of view) – and fellow canines pick up on this lop-sided tail language.
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