However, a morph of the grove snail also has a white lip.

More recently, the grove snail has been introduced to North America, and Venezuela.

It is a close relative of the grove snail also known as the brown-lipped snail.

The grove snail, Cepaea nemoralis, is famous for the rich polymorphism of its shell.

Cepaea nemoralis, the "grove snail," or the Spanish "vaqueta", measures about 25 mm across the shell.

Apart from the band at the lip of the shell, grove snails are highly polymorphic in their shell colour and banding.

The white-lipped snail is very slightly smaller than the grove snail, the shell being usually about 2.5 cm (1 in) in maximum dimension.

The grove snail is closely related to the white-lipped snail, C. hortensis, shares much the same habitat, and has similar shell colour and pattern.

The range of the white-lipped snail extends closer to the Arctic in Northern Europe than the range of the grove snail.

The white-lipped snail has been introduced to northeastern parts of the USA, but has not established itself as successfully as the grove snail.

A similar system of genetic polymorphism occurs in the White-lipped Snail Cepaea hortensis, a close relative of the grove snail.

The grove snail or brown-lipped snail (Cepaea nemoralis) is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc.

Egg sizes differ between species, from a 3 mm diameter in the grove snail to a 6 mm diameter in the Giant African Land Snail.

The two species share many of the same habitats, such as woods, dunes and grassland, but the white-lipped snail tolerates wetter and colder areas than the grove snail can.

Like the grove snail, it has considerable variability in shell colour and banding, although the shell of the white-lipped snail is perhaps most commonly yellow, with or without brown banding.

The striking polymorphism of the Grove snail may be an example of this, as predators like the Song Thrush search for snails of patterns that they recognize, though other explanations exist.

The principal distinguishing feature of this species is a white lip at the aperture of the shell in adult specimens, although very rarely the brown-lipped grove snail can have a white lip, and vice versa.

The Grove Snail (Cepaea nemoralis) is regularly eaten by the Song Thrush, and its polymorphic shell patterns have been suggested as evolutionary responses to reduce predation; however, Song Thrushes may not be the only selective force involved.

The grove snail is usually the larger of the two species when mature, but the principal difference is that the adult grove snail almost always has a dark brown lip to its shell, whilst adults of Cepaea hortensis almost always have a white lip.

Selection in the polymorphic land snail Cepaea nemoralis (L.).

The grove snail or brown-lipped snail (Cepaea nemoralis) is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc.

The Grove Snail (Cepaea nemoralis) is regularly eaten by the Song Thrush, and its polymorphic shell patterns have been suggested as evolutionary responses to reduce predation; however, Song Thrushes may not be the only selective force involved.