Parasite

I wrote something along these lines once, but this is better:

There’s a parasite that eats crabs from the inside. It enters the crab by penetrating a weak spot, then spreads long rootlike tendrils through the crab’s interior... The crab’s immune system fails completely to recognize it, and it soon takes over the hapless crustacean, body and brain... It looks like a crab. It moves like a crab. For all I know, it tastes like a crab. But it isn’t a crab. Not anymore...

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