In late July I hiked the Lakeshore Trail at Apostle Islands National Lakeshore in Wisconsin. One of the many insects I found while in that section of the North Woods was this male stag beetle (Coleoptera: Lucanidae: Ceruchus piceus). Beetles in this family are most often found in wooded areas. Larvae feed on decaying wood, and adults feed on plant sap and fruit juices. This particular species is distributed throughout the northeastern United States and southeastern Canada.
The males of many species of stag beetles have enlarged mandibles as seen here. The common name comes from the resemblance the big, branched mandibles have to the antlers of deer. As with deer, male stag beetles use these features for fighting with each other.