Movements of field mice Apodemus agrarius (Pallas) in a suburban mosaic of habitats.

Movements of field mice (Apodemus agrarius) were studied using snap traps and coloured bait. The presence of coloured bait was recorded in 35% of field mice captured. Of animals with coloured bait, 60% had moved further than 100 m. The longest distances traversed by field mice exceeded 1000 m. It is suggested that live-trapping on a grid of several hectares is not an adequate method of studying small-mammal movements.