crabs modifying shells?

i remember reading that crabs will modify their shells to accommodate themselves or get a better fit. does anyone have any information about this topic? can totally be anecdotal, im just curious! + of course crab tax from before jack changed shells!

i remember reading that crabs will modify their shells to accommodate themselves or get a better fit. does anyone have any information about this topic? can totally be anecdotal, im just curious! + of course crab tax from before jack changed shells!