Stag beetles are a group of about 1,200 species of beetle in the family Lucanidae.
Most stag beetles grow to around 5 cm (2 in).
The name of the stag beetles is due to how they look. The mandibles on the male resemble the antlers of stags.
Male stag beetles fight each other using their mandibles. They fight to establish mating sites.
Stag beetles are not normally aggressive toward humans.
Female stag beetles are smaller than males and their mandibles are not as large.
Stag beetle larva spend several years feeding on rotting wood.