You usually only see the spores that boring sponges leave behind: small holes in shells or in soft stone. The boring sponge is visible as small yellow or orange nipples on shells or limestone. It uses acid to drill tunnels in the calcium material. The only function of the shell or stone is a place to live for the sponge. The shellfish living in the drilled shell is not consumed, but usually dies since its protective covering has been damaged.
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