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I think it just shows the adaptability of nature - the crab had a shell previous to moving into the bottle - it just found the bottle more roomy and decided to use it.
Hermit crabs do not "Automatically" grow larger over time - even after shedding they can remain the same size for a very long time, until a suitable larger shell becomes available,or in this case bottle.
Had the crab not found the bottle to his liking, he would simply have remained at the same size and kept his old shell.
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