For the season itself, based on my experience, only 6-8 times a year, including the mating seasons, and usually they came out from their nest on the rain season only.
Right now the weather changed, it's rainy season, and guess what, it's hunting time!!
To catch this beetles, is quite different from the others, because this beetles always came out in the early morning, around 06.00 AM, and return to their nest at 11.00 AM.
Based on my experience in collecting stag beetles, this one is the only beetles that capable flying out in the day.
They flies and search for this special bushes, and in local we call it Cengkodok trees.As you can see the picture below, if you watched carefully, there's a mandible hided under the Cengkodok leaf.

They eat the nectar from Cengkodok flower, and usually the flowers it self blossoming 8 times a year, that's is why the seasons comes (I think !!).
This Cengkodok trees is an native trees and only can be found around South East Asia, and the habitat is around the river bank and a great plains.
To catch this stag beetles, I need some net, and to find where's the beetles colony hiding , sometimes I used my own methods, first; find a bush that has no farmers activity, because when there's farmers, sometimes they used insecticide, and guess what, absolutely there will be no more Cyclommathus Tarandus living there.
And the second method, I like to use a river path, the reason is, I don't have to spend much times on searching the beetles when they fall into the bushes.When they on river, it's so easy to caught it, because they can't swim!!!!ha,ha,ha,ha...(They should learned how to swim....)

The most difficult task in catching this Tarandus is to find where is the colony, sometimes it's takes a day, even a week, but the impossible thing for me until now is to find their nest. I don't know what and how, until now I can't find it.
The season itself only takes a couple of 3 weeks.After that, I need to wait until the other seasons.Sometimes for 1 season, I can't catch even a single beetle.
To unable catch some nice and big Tarandus, I need to wait for the mating season, because in this times, the superb and beautiful males is out for mating.I hope this is the times, because I don't have any idea when they will come.
The biggest Cyclommathus Tarandus that I ever had is 70 mm, and that's really rare, only 1 in a million, 8 years ago.But, to catch that size again, I don't think so, it's like almost impossible for this times.The largest that I ever catched since that day is only 69 mm, about 2 years ago.
I hope for this season, I can find those giant male of Cyclommathus Tarandus again.
In mating
Eating the nectar