Order: Coleoptera. Family: Lucanidae.
The stag beetle's name comes from the large protruding mandibles, which males use to contest each other for mates. The wrestling resembles the antlers of stags being used to fight over females.
Diet: Larvae feed on decaying trees. Adults feed on tree sap and decaying fruit.
Distribution: Worldwide except for Antarctica.
University of Nebraska State Museum Department of Entomology, http://museum.unl.edu/research/entomology/Guide/Scarabaeoidea/Lucanidae/Lucanidae-Catalog/LucanidaeC.htm
University of Iowa Department of Entomology, Bug Guide, http://bugguide.net/node/view/3103