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Stag Beetles

Lucanidae (e.g., Lucanus elaphus, giant stag beetle; Lucanus mazama, southwestern stag beetle)[3]

Stag beetles are large, dark beetles; males have long antler-like jaws used to wrestle rival males, and the grubs spend years in rotting wood, helping break down fallen trees.[1][2]

Group
Insect
Order
Coleoptera
Family
Lucanidae
US records
37 states
Sources
3 cited
Updated
2026-10-16
Male giant stag beetle with long curved jaws on a rock
Male giant stag beetle with long curved jaws on a rock. (c) skitterbug, some rights reserved (CC BY) — via iNaturalist, CC BY 4.0
On this page
  1. Identification
  2. Where it lives
  3. Biology
  4. Damage and signs
  5. Health risk
  6. Control
  7. Related profiles
  8. Common questions
  9. Sources

How to identify it

  • Adults are dark reddish brown to nearly black; the southwestern stag beetle is 25-35 mm long, and males of the giant stag beetle have jaws that may be as long as the rest of the body.[1][2]
  • Males have far larger jaws than females, which makes the sexes easy to tell apart.[1][2]
  • Larvae are pale, C-shaped grubs found in rotting wood.[1][2]

Where it lives

Clemson reports seven species in South Carolina, with the giant stag beetle the largest; it ranges west to Oklahoma and Nebraska, while the southwestern stag beetle lives in forests of western and southwestern Colorado.[1][2]

US map: public records from 37 states since 1990 (GBIF).

Biology and life cycle

Most of the 3- to 5-year life cycle is spent as a grub feeding in decaying wood; the giant stag beetle's larvae develop in oak stumps.[1][2]

Adults live only a few months, mainly May to August in South Carolina and mid-July to mid-August for the southwestern species; they fly at night and come to lights.[1][2]

Damage and signs

  • They do not damage homes or plants; the grubs are decomposers of rotting wood.[1][2]

Health risk

Clemson says they are harmless and will not hurt people or pets; the males' jaws are for fighting other males, not biting people.[1]

Control

Prevention

No control is needed; leave them be, or move a beetle outdoors.[1]

Common questions

Do stag beetles pinch?
They're sometimes called pinching bugs, but Clemson says they are harmless; the males' jaws are for fighting rivals.[1]
Can stag beetles fly?
Yes; despite their bulk, adults fly, mostly at night, and come to lights.[1][2]
Where do stag beetle grubs live?
In rotting wood, such as stumps and fallen trees, for several years.[1][2]

Sources

  1. Clemson Cooperative Extension Home & Garden Information Center, “Stag Beetles.” hgic.clemson.edu/stag-beetles/ (accessed 2026-10-15)
  2. Colorado State University Extension (Colorado Insects of Interest, W. Cranshaw), “Southwestern Stag Beetle (Colorado Insect of Interest).” wci.extension.colostate.edu/wp-content/uploads/sites/14/2017/03/SouthwesternStagBeetle.pdf (accessed 2026-10-15)
  3. iNaturalist, “Lucanus taxon page (order and family).” www.inaturalist.org/taxa/60813 (accessed 2026-10-06)

Updated 2026-10-16. Built from sourced records. Spot an error? Tell us.