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Stag Beetle

Lucanus cervus

Not yet photographed by the community

UK's largest beetle; males have antler-like mandibles.

Species Profile

Priority Species for conservation; listed as protected under Schedule 5 of the Wildlife and Countryside Act 1981.

Lifespan: 5–6 years total, with adults active for 2–3 months during summer
Size & Weight: Males 25–84 mm (including mandibles); females 28–50 mm; highly dimorphic
Habitat: Ancient woodlands, parks, and gardens with decaying hardwood timber, particularly oak and ash stumps.
UK Distribution: South-east England, with strongholds in Kent, Sussex, Surrey, and Hampshire; rare or absent in northern Britain. Resident species with no migration.
Diet: Adults feed on tree sap and exudates, particularly from oak trees; larvae are xylophagous, feeding on decaying heartwood.
Predators: Badgers, foxes, birds (particularly jays and magpies), and parasitic flies during larval stage.
Mating Season: May to August, peak activity June to July
Breeding: Females lay eggs singly in dead wood; larvae develop over 3–4 years in decaying logs; single generation per year.
Behaviour: Highly territorial males engage in dramatic battles using enlarged mandibles to compete for females. Both sexes are nocturnal and attracted to lights. Males fly heavily and clumsily at dusk.

Did You Know?

•Male mandibles can exceed body length and are used exclusively for combat; females have smaller, weaker mandibles
•Larvae require 3–4 years of development inside decaying wood, making habitat continuity critical for population survival
•Adults do not feed on wood; their role is strictly reproductive, with no digestive system adapted for timber consumption
•The species is a flagship insect for ancient woodland conservation in south-east England
•Population has declined significantly since the 1950s due to loss of dead wood habitat and fragmentation of ancient woodlands

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