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, which ...

Snails are slow-going, but some serious muscles (and an extra foot) are hidden underneath the large shells they carry.

Snails, like all animals, need to remember. They need to remember what is good or bad to eat, what might be trying to eat them, and who they recently mated with. All of these things can prove ...