Belongs to: beetles
Compare with: leaf beetle
Dor beetle Geotrupes stercorarius
Also known as: lousy watchman, scarab beetle
Best time to see: Apr to Oct
Key facts
Dor beetles are shiny black beetles that use animal dung to feed their young, thereby helping to recycle it
Common, found anywhere where there are grazing or browsing animals
Adults often have a colony of mites living on their undersides, which can be seen by turning them over
Recognition
Black striated case with a violet sheen; clubbed antennae; broad, spurred black legs; up to 25mm
Lifecycle
Adult beetles pair up and jointly dig tunnels below the dung and drag dung down into them
The female lays a single egg in the dung and the emerging grub eats its way through it
Strong fliers, flying around to find fresh cow-pats to exploit, normally in the evening
© Tony Gunton