Queen ants have one of the longest life-spans of any known insect - typically up to 30 years. Western harvester ant queens can live up to 40 years!
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Sifrhippus was a species of horse about the size of an average duck and roamed North America 56 million years ago.
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The Basenji dog is the only dog that is not able to bark.
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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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An alligator can go through 2,000 to 3,000 teeth in a lifetime.
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Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
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A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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