A snail ... I don't know anything about snails.
Is it a water one? It is here on the pond foliage ...
Helix pomatia, common names the Burgundy snail, Roman snail, edible snail or escargot, is a species of large, edible, air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Helicidae. It is a European species. It is called by the French name escargot when used in cooking. Although this species is highly prized as a food it is difficult to cultivate and rarely farmed commercially.