Large Red Slug
Arion ater
Length up to 12cm

Widespread and common throughout Britain and Ireland. Occurs in almost all terrestrial habitats. Body is uniform in colour but seen in two forms: orange-red form is commonest in S and in gardens while black form prevails in N and upland areas. When alarmed, contracts into an almost spherical ball and often rocks from side to side. Mucus colourless. Lays clusters of pale eggs under logs.