Stag Beetle

Stag beetles are a family of about 1,200 species of beetles in the family Lucanidae. Some species grow to over 12 cm (4.7 in), but most are about 5 cm (2.0 in). The English name is derived from the large and distinctive mandibles found on the males of most species, which resemble the antlers of stags. Male stag beetles use their jaws to wrestle each other for favoured mating sites or resources. Female stag beetles are usually smaller than the males. Their mandibles, though smaller, are much more powerful than the males. https://en.wikipedia.org/wiki/Stag_beetle