All mollusks build their own shells, whether they live in water or on land. Creatures like snails, clams, oysters and mussels use an organ called a mantle to secrete layers of calcium carbonate ...

Probably rats. They like to eat snails and tend to hang out in a favorite spot to enjoy them. I’ve also found piles of snail ...

‘I’m always amazed that people hate slugs so much. I don’t know what a shell does to a snail to make it lovable,’ says Jon. Slugs actually do have a shell, but it’s internal. Their shell has been ...