Dorcus titanus
The giant stag beetle — massive mandibles, impressive size, and a larval diet that differs fundamentally from flower beetles.
About Dorcus titanus
Dorcus titanus is the largest stag beetle (Lucanidae) in the world, with males reaching up to 110mm including mandibles. Native to Southeast Asia — found across Indonesia, the Philippines, and surrounding regions — males have enormous, curved mandibles used for wrestling rival males off branches. Females are smaller with proportionally modest jaws.
This is an intermediate species, but be aware that stag beetle husbandry differs significantly from flower beetle (Cetoniidae) or rhinoceros beetle (Dynastidae) care. The larval substrate requirements are different, and getting them wrong is the most common reason keepers fail with this species.
Larval care
Stag beetle larvae feed on decaying hardwood — not flake soil. The key substrate for Lucanidae is kinshi (fermented hardwood sawdust blocks, typically oak or beech colonised by beneficial fungi) or well-decayed hardwood pieces packed in moist substrate.
- Use kinshi bottles or blocks — fermented hardwood inoculated with white-rot fungi
- Alternatively, use chunks of well-decayed deciduous hardwood in moist substrate
- Never use softwood — pine and cedar are toxic
- House larvae individually in 1–2 litre containers (kinshi) or larger with wood
- Replace kinshi every 3–4 months or when heavily consumed
Temperature significantly affects development time and adult size. Cooler temperatures (20–22°C) produce longer larval periods but larger adults. Warmer temperatures speed development but often result in smaller beetles.
L3 larvae construct a pupal cell inside the wood or substrate. Do not open or disturb the container once feeding stops. Pupal cells for stag beetles are particularly fragile — any damage is usually fatal.
Adult enclosure & feeding
Adults need a ventilated enclosure with 5–8cm of moist coconut fibre and plenty of bark for hiding. Unlike flower beetles, Dorcus are largely nocturnal. Provide beetle jelly as the primary food — it is clean and prevents substrate fouling. Soft fruit (banana, apple) works as a supplement.
Males can be aggressive. House separately or provide ample space and hiding spots. Males will fight, and those mandibles can cause real damage to other beetles.
Breeding
Place a mated female in a container with soft, decaying hardwood partially buried in moist substrate. Females chew into the wood to create egg chambers. Eggs hatch in 3–5 weeks. Remove the female after 4–6 weeks and leave the wood undisturbed — tiny L1 larvae will emerge from the wood over the following weeks.