We analyzed the expression of edge following behavior in German cockroaches, Blattella germanica (L.). Structure of the environment and spatial distribution of resources modified both expression of locomotory behavior of cockroaches and its distribution between the edge and the central area of an experimental arena. When they are in a familiar environment, German cockroaches are definitely not edge followers and they exploit similarly the different parts of the accessible surface of their home range. Cockroaches placed in a new environment tended to follow edges more than undisturbed insects. This modification could be assimilated to a response to stressful conditions.