Carcinisation (or carcinization) is an example of convergent evolution (https://en.wikipedia.org/wiki/Convergent_evolution) in which a crustacean (https://en.wikipedia.org/wiki/Crustacean) evolves (https://en.wikipedia.org/wiki/Evolution) into a crab (https://en.wikipedia.org/wiki/Crab)-like form from a non-crab-like form.
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Why Do Things Keep Evolving Into Crabs?
Carcinisation (or carcinization) is an example of convergent evolution (https://en.wikipedia.org/wiki/Convergent_evolution) in which a crustacean (https://en.wikipedia.org/wiki/Crustacean) evolves (https://en.wikipedia.org/wiki/Evolution) into a crab (https://en.wikipedia.org/wiki/Crab)-like form from a non-crab-like form.