Nigel Cattlin / Spanish slug (Arion vulgaris) with closed pneumostome on grass, light grey colour variation. Berkshire, England, UK. August.

Nigel Cattlin / Spanish slug (Arion vulgaris) on grass, tan colour variation. Berkshire, England, UK. August.

Robert Thompson / Spanish slug (Arion vulgaris) in garden, Banbridge, Co. Down, Northern Ireland. August

Robert Thompson / Spanish slug (Arion vulgaris) in garden, Banbridge, Co. Down, Northern Ireland. August

Alex Hyde / Spanish Slug (Arion vulgaris), Derbyshire, UK. August. Invasive species.

Nick Upton / Iberian slug (Arion vulgaris) an invasive species in northern Europe, crossing forest path after rain, near Stralsund, Mecklenberg, Germany

Roman Willi / Spanish slug (Arion vulgaris) feeding on a flower, Lucerne, Switzerland. September.

Roman Willi / Spanish slug (Arion vulgaris) feeding on a petal, Lucerne, Switzerland. September.