Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
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Alligators can live up to 100 years.
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One reason that kittens sleep so much is because a growth hormone is released only during sleep.
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A lion in the wild usually makes no more than twenty kills a year.
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During World War 1, starving wolves amassed in such great numbers that Germans and Russians had a temporary cease fire to fight off the wolf attacks.
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Cows can sleep standing up, but they can only dream lying down.
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Denmark has twice as many pigs as there are people.
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Cats recognise the voice of their owner, but never evolved to care.
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