They will battle each other, trying to push each other off the log, the one to stay on the log is the winner.
This is a huge source and loss of money to many people, especially in the Ryukyu Islands.
The earliest beetles will come out of the ground in late spring; they will usually die around middle September to early October.
They usually will die after mating and laying eggs.
The long cephalic horn of this species has a characteristic shape in the form of the letter Y and it is used by males during the mating period and to maintain territories.