ChatterBank12 mins ago
crabs
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why don't hermit crabs grow their own shells?
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For more on marking an answer as the "Best Answer", please visit our FAQ.In simple terms it is all a matter of risk and cost. The crab does not have to use up energy and body resources making a shell of its own. The risk is that it is vulnerable if it outgrows its current shell and cannot find a suitable larger one nearby. Evolution has gone down this path where there are plentiful resources (ie discarded shells).