Stag Beetle, Sulawesi.

Stag beetles are some of the most well known and easily recognised beetles. In competing for mates, males use their enlarged mandibles for grappling rivals. Adult stag beetles are relatively short-lived, spending most of their lives in the larval stage, consuming rotting wood.These and other wood boring beetles play an important role in forest ecosystems, physically breaking up dead wood and accelerating colonisation by bacteria and
fungi.