Simsons Stag Beetle (Hoplogonus simsoni) is a flightless, glossy black, ground-dwelling beetle reaching up to 32 mm in total length. Stag beetles have enlarged mandibles (or jaws) which, in their resemblance to the antlers of a male deer (or stag), give these beetles their name. Simsons Stag Beetle is found only in a small area of north-eastern Tasmania centred on the Blue Tier. Simsons Stag Beetle lives in leaf litter on the floor of mature wet eucalypt forest, damp forest, rainforest and mixed forest. A deep layer of accumulated leaf litter is vital to the survival of this species. The main threat to this species is any activity resulting in exposure and drying of the soil and leaf litter. This includes activities that open up the forest canopy or disturb the forest floor, such as cutting or clearing live or dead vegetation, and burning.