Bug FAQEuropean Stag Beetle
Lucanus cervus · Order: Coleoptera · Family: Lucanidae
Also called: Stag Beetle
Larvae live in rotting wood and take several years to develop before pupating in the soil for about three months; adults appear from late May to early August and feed on nectar, fruit juices and tree sap. Females can bite painfully, but the male’s large mandibles are too weak to cause injury.
Source: Wikipedia
How to recognize it
They are usually black with reddish wing covers, and males have red, enlarged mandibles.
Source: Wikipedia
Size
Males grow up to 7.5 cm (3 in) long, while females are between 3 and 5 cm (1.2 to 2 in). This species is the biggest beetle found in Europe.
Source: Wikipedia
Does it bite or sting?
Females can deliver a painful bite. Male mandibles look threatening but are too weak to cause harm.
Source: Wikipedia
Where it lives
They are linked to many tree types such as oak, lime, beech, willow, black poplar, ash, horse chestnut, wild cherry and common walnut. Larvae are often found near dead wood of introduced red oak (Quercus rubra).
Source: Wikipedia
What it eats
Larvae, which are blind and C-shaped, eat rotting wood in stumps, old trees, fence posts, compost and leaf mould. Adults sip liquids from nectar, fallen fruit and tree sap.
Source: Wikipedia
Life cycle
The larvae pass through several growth stages over several years before becoming pupae. Pupae stay in the soil for about three months and emerge in summer to fly and mate.
Source: Wikipedia
When you see it
Adults are seen from late May to early August, especially in the evenings.
Source: Wikipedia
Where it comes from
They are widespread across Europe but do not occur in Ireland. They also live in the European part of Turkey and are mainly in northern and central Italy.
Source: Wikipedia
Lookalikes
In Britain, female European stag beetles are often mistaken for the lesser stag beetle. Lesser stag beetles are smaller, completely black, and have a larger, squarer head.
Source: Wikipedia
Where it is found in the US
Recorded in 1 of 51 states and DC. Most records: Kansas.
Darker = more records. Counts are museum and citizen-science records, not population size.
Source: GBIF
More photos
Questions people ask
When can I see adult stag beetles?
Adults appear from late May to early August and are most active in the evenings.
Source: Wikipedia
How can I tell a European stag beetle from a lesser stag beetle?
European females are larger, have reddish wing covers and red mandibles in males; lesser stag beetles are smaller, all black, and have a squarer head.
Source: Wikipedia
What do the larvae eat?
The larvae feed on rotting wood found in tree stumps, old trees, fence posts, compost heaps and leaf mould.
Source: Wikipedia
Same family (Lucanidae)
Sources
- Wikipedia: https://en.wikipedia.org/wiki/Lucanus_cervus
Look it up elsewhere: GBIF · iNaturalist · BugGuide · Wikipedia
Text written 2026-10-24 from the sources above and checked sentence by sentence against them. Data fetched 2026-10-22.