A trap 10 has an outer case 12, an inner case 14 from which a rain cover 24 extends to define apertures 30,32 between the case 12 and cover 24. In use, the inner case 14 includes an attractant, such as beer, and the apertures 30,32 are sufficient to allow slugs or snails through but limit other access. The inner case 14 is removable with collected slugs or snails whilst the outer case 12 remains buried.