Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
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Cats recognise the voice of their owner, but never evolved to care.
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The Basenji dog is the only dog that is not able to bark.
4
Alligators can live up to 100 years.
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Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
6