Burrowing in sand can prevent algae from forming on the shell, and can be abrasive, but it s not what keeps a cowrie shell clean. Next Question 9. Limpets don t burrow into the sand. They normally move around on rocks, where they eat algae. Most terebras have a long, slender shell, well suited for their sand-burrowing.
Many olive shells feed by traveling just under the surface of sand in their bullet-shaped shells.
Many cone species burrow in sand for protection, with the pointed end of their shell forging the way. Next Question 8. A snail s periostacum is a coating that often hides a beautiful shell underneath. A snail s periscope is usually called a siphon. Snails generally use smell, sight and feel to find food.