" If a snail’s shell gets injured, a repair can be made quickly. New shell material is secreted by the mantle, and where there was once a crack, a scar appears, looking much like a skin scar. Even a missing shell section can be replaced. Oliver Goldsmith described this in 1774: Sometimes these animals are crushed seemingly to pieces, and, to all appearance, utterly destroyed; yet still they set themselves to work, and, in a few days, mend all their numerous breaches . . . to the re-establishment of the ruined habitation. But all the junctures are very easily seen, for they have a fresher colour than the rest; and the whole shell, in some measure, resembles an old coat patched with new pieces. "

― , The Sound of a Wild Snail Eating