Both male and female L. datunensis have a russet elytra which provides them camouflage to hide within the dirt, and hook-like claws at the end of their feet, which allow them to grab on to tree barks.

During the larval stage, Lucanus datunensis would be consuming rotten grass and soil as their major food source.

The region is at an elevation level of 800–1100 meters, which is relatively low when compared to other stag beetles species in Taiwan.

For other stag beetles, the hilltop region would not be an ideal habitat as they mainly feed on resins and fruit, live on tree branches, and lay their egg in rotten wood pieces.

[1] Lucanus datunensis, being the smallest stag beetle in Taiwan and having a behaviour of constantly flying on top of the grass field during the day, has a lot of predators that would feed on them.

Its main predators in Taiwan are mostly birds and lizards such as Plestiodon elegans and light-vented bulbul (Pycnonotus sinensis).

[5] Since the hilltop region of Tatun Mountain is close to various tourist attractions and farmlands, human activity became the major of the Lucanus datunensis.

The natural habitat of L. datunensis had drastically decreased as lands were used in the construction of roads and agriculture industry of planting teas.

The pesticides used by the agriculture industry are also threatening the L. datunensis as the beetles often got closed to the farmlands due to lack of habitat.