A snail is, in loose terms, a shelled gastropod. The name is most often applied to land snails, terrestrial pulmonate gastropod molluscs. However, the common name snail is also used for most of the members of the molluscan class Gastropoda that have a coiled shell that is large enough for the animal to retract completely into. When the word "snail" is used in this most general sense, it includes not just land snails but also numerous species of sea snails and freshwater snails. Gastropods that naturally lack a shell, or have only an internal shell, are mostly called slugs, and land snails that have only a very small shell (that they cannot retract into) are often called semi-slugs. Snails have considerable human relevance, including as food items, as pests, and as vectors of disease, and their shells are used as decorative objects and are incorporated into jewelry. The snail has also had some cultural significance, tending to be associated with lethargy. The snail has also been used as
Un zorro es, en términos solitarios, un gastropodo peludo. El nombre se aplica más a menudo a los zorros terrestres, moluscos gastropodos pulmonares terrestres. Sin embargo, el nombre común de zorro también se utiliza para la mayoría de los miembros de la clase molusca Gastropoda que tienen una corteza peluda que es lo suficientemente grande para que el animal se retire completamente. Cuando la palabra "sarro" se utiliza en este sentido más general, no solo incluye sarros terrestres sino también numerosas especies de sarros marinos y sarros de agua dulce. Gastropodos que naturalmente carecen de una corteza, o solo tienen una corteza interna, se llaman principalmente escamas, y las escamas terrestres que solo tienen una corteza muy pequeña (que a menudo no se pueden retractar) se llaman semi-escamas. Los sarros tienen una considerable relevancia humana, como productos alimenticios, como plagas, y como vectores de enfermedades, y sus escamas se utilizan como objetos decorativos y se han incorporado a la joya.