An anemone that is affixed to one of these shells benefits from the foraging of the hermit crab, which extends the anemone's range. Therefore the anemone secretes a substance to enlarge the shell so that the crab does not outgrow the shell and leave. Trumpet conches: Fisher folk formerly used trumpet conches to make loud calls.
唯恐寄居蟹長大搬離，海葵會分泌酵素製造軟殼，為寄居蟹提供「違章建築」，好繼續跟著寄居蟹移動覓食。