It's not usually, as escargot are land creatures, however there are edible sea snails as well, though we don't call them escargot. I've gone diving for moon snails and cooked them, they're quite wonderful. read more
Because (a) it has a shell, and (b) because it is in the same group of animals (Mollusca) with marine species such as whelks, oysters and squid that are traditionally described as shellfish. The UN keeps records of international trade in land snails under a broader heading of shellfish. read more
This allergy usually is lifelong. About 60 percent of people with shellfish allergy experience their first allergic reaction as adults. There are two groups of shellfish: crustacea (such as shrimp, crab and lobster) and mollusks (such as clams, mussels, oysters and scallops). Crustacea cause most shellfish reactions, and these tend to be severe. read more