Geotrupes stercorarius (Linnaeus, 1758)
    Generally common throughout the British Isles although in our experience numbers have fallen over the last few decades. Adults are active from April until September, being found in various types of dung (even canine, pers. obsv) but horse seems to be preferred. Typically found in flight on warm summer and autumn evenings, they also fly in bright sunshine maintaining a slow meandering course about a metre above the ground. Vertical burrows are excavated beneath dung and lined with dung pellets into which eggs are laid. On Croxley Common moor, where the topsoil is shallow adults can be found at finger depth in these burrows during the day. Colonies often contain both stercorarius and G.spiniger (Marsh.).

    16-25mm. Slightly metallic black above, brilliant metallic blue or green below. Elytral striae strong, obvious without magnification, seven between suture and humeral prominence. Pronotum with a complete basal border. Posterior tibiae with three transverse ridges (including the apical one) on the outer sides, the basal of which does not continue to the inner margin. Abdominal ventrites uniformally setose and punctured (cf G.spiniger) Male hind femora with a small blunt tooth on posterior surface.

Description from 2 Watford specimens at X10