The Japanese stag beetle, known scientifically as Lucanus maculifemoratus, is a large insect native to Japan. Males are easily recognized by their impressive, antler-like mandibles, which they use in battles for territory and mates. These beetles typically measure between 3 to 8 centimeters in length and are often found in forests and wooded areas. The diet of the Japanese stag beetle primarily consists of tree sap and decaying wood. The larvae develop in rotting wood, where they feed and grow before emerging as adults. This species is popular in entomology and is often kept as a pet due to its striking appearance and fascinating behavior.