Geodorcus capito is a large flightless species of stag beetle in the family Lucanidae.

During the day, beetles can be seen hiding under rotten branches and inside debris on tree trunks.

All life cycle stages, including eggs, have been seen in moss covered cavities of trees on Chatham Island.

Stag beetle larvae consume rotting wood at or above ground but a few species live underground and feed on either roots or humus.

[3] Like other Geodorcus species, G. capito is protected under Schedule 7 of The 1953 Wildlife Act, making it an offense to collect or harm a specimen.