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.

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