European Stag Beetle

Lucanus cervus

Illustration of a stag beetle with large antlers and a red abdomen
Distribution:Europe
Size:75mm
Diet:Decaying wood (larvae), sap (adult)

Lucanus cervus is the UK’s largest beetle (if you exclude a reasonably famous pop group*) and can also be found across Europe. Their giant antlers are modified mandibles and are only enlarged in the males. Like the non-insect stags from which their name derives, stag beetles use these antlers to fight over mating rights and sometimes food. Having vanquished a foe, the male will attempt to impress a prospective mate by circling her and raising his jaws aloft.

Like many beetles and other holometabolous insects, stag beetles spend most of their life as larvae. These cream-coloured minions are small and blind, predominantly living underground where they feed on rotting wood and leaves.

This illustration is based on a specimen I photographed in the Oxford Natural History Museum, which has an incredible array of insect displays and is well worth a visit.

*yes, I know it’s spelled differently

Take a closer look…

Close up showing the stag beetle's head and distinctive antler
Close up showing the beetle's red elytra