Giant Stag Beetle

Scientific Name: Lucanus elaphus

Order & Family: Order Coleoptera; Family Lucanidae

Size: 45–60 mm (1.8–2.4 inches) for males; females are slightly smaller.

Giant Stag Beetle

Natural Habitat

Found in deciduous forests across North America, often near old or decaying wood such as logs and stumps.

Diet & Feeding

Adults feed on tree sap and decaying fruit; larvae (grubs) eat decaying wood and organic matter in the soil.

Behavior Patterns

Males use their large mandibles to fight other males for territory and mates. They are typically nocturnal and are often attracted to artificial lights at night.

Risks & Benefits

Generally harmless to humans; mandibles are for display and fighting other beetles, not biting. Benefits include recycling nutrients into the soil by breaking down rotting wood.

Identified on: 6/14/2026