Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
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If a vampire bat goes 2 days without drinking blood, they can die. However, well fed female bats will puke up blood and share it with other bats that they like in exchange for grooming.
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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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Cats recognise the voice of their owner, but never evolved to care.
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Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
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Penguins have a gland above their eye that turns saltwater into freshwater.
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Lobsters have blue blood.
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