Sumatran Giant Stag Beetle
The Sumatran Giant Stag Beetle is a large flat stag beetle native to the island of Sumatra, prized for its flattened, powerful body and thick, curved mandibles. Adults range from about 30 to 110mm, and individuals over 100mm are genuinely striking to see. It's a classic foreign stag beetle whose popularity rivals Japan's native giant stag beetles, but its somewhat feisty temperament and strong jaws mean it's usually kept one to an enclosure — a rewarding species for keepers who already have some stag beetle experience.
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Sumatran Giant Stag Beetle key facts
- Care level
- Intermediate
- Lifespan
- Adult 1-2 years
- Size
- 30-110mm
- Temperature
- 20〜27℃
- Diet
- Tree sap, beetle jelly
- Housing
- Set up a small to medium case with egg-laying logs and fermented substrate. Feed adults beetle jelly; adults live about 1-2 years.
- Temperature & Humidity
- Maintain 20-27°C. Avoid extreme heat and mist the substrate so it does not dry out.
- Larval Care
- Raise in fermented mat or fungal bottle
- Breeding
- Lays in soft logs or mat
- Tank Mates & Compatibility
- It is aggressive with a powerful grip, so keep singly rather than together. Do not leave a pair unattended during pairing.
- Notes
- Handle carefully as mandibles are extremely powerful
About Sumatran Giant Stag Beetle
A large flat stag beetle from Sumatra with a flattened body and powerful mandibles. Adults reach 30-110mm, rivaling Japan's native giant stag beetles in popularity — best suited to intermediate keepers.
7 things to know before welcoming a Sumatran Giant Stag Beetle
1Mind the Powerful Jaws
The mandibles of the Sumatran Giant Stag Beetle are especially powerful among flat stag beetles, and a pinch can genuinely hurt. When handling, grip the thorax rather than reaching near the head or jaws, and supervise children closely around larger males.
2House Them Separately
Sumatran Giant Stag Beetles can be aggressive, and housing multiple males together often leads to serious fights that injure mandibles and legs. Keep males and females separate except during deliberate, supervised pairing for breeding, and give each beetle its own enclosure.
3Prefers Warm, Humid Conditions
As a tropical species from Sumatra, this beetle doesn't need the cold-weather dormancy that Japan's native giant stag beetles go through. Keep it at a stable, warm temperature year-round with adequate humidity, since sudden drops in temperature can make it sluggish.
4Give It Substrate to Burrow In
These beetles like to burrow into substrate or hide during the day, so line the enclosure with a reasonably deep layer of insect mat. Adding a piece of driftwood or a climbing branch also helps if the beetle flips onto its back and needs something to grip to right itself.
5Nocturnal and Shy by Day
This beetle is nocturnal and typically stays still and hidden during the day — that's normal behavior, not a sign of illness. If you want to see it active, check quietly in the evening rather than disturbing it during daylight hours.
6Feed With Insect Jelly
A standard insect jelly diet works well and is easiest to manage — placing it on a small feeding stand helps keep the substrate clean. Fresh fruit like banana can be given occasionally but tends to spoil and attract mold faster, so jelly should make up the bulk of the diet, replaced as soon as it dries out or molds.
7Adult Lifespan of 1-2 Years
Adults typically live around one to two years, shorter than Japan's native giant stag beetles, which can live for several years. It's worth thinking ahead about how long you can commit to care before bringing one home, and if raising from a larva, factor in the time to eclosion as well.
Frequently asked questions about Sumatran Giant Stag Beetle
- Q.Can beginners keep this species?
- A.It's generally considered an intermediate-level species. Day-to-day care isn't especially difficult, but points like handling the powerful mandibles and housing beetles separately mean it helps to research thoroughly before bringing one home.
- Q.Can I keep more than one together?
- A.Housing multiple beetles in the same enclosure isn't recommended because of fighting risk. Males in particular can be aggressive and injure each other with their mandibles, so one beetle per enclosure is the safer approach.
- Q.Does it need special winter care?
- A.Since it's a tropical species from Sumatra, it doesn't go through the cold-weather dormancy that Japan's native giant stag beetles do. Just make sure the temperature stays stable and doesn't drop too low year-round.
- Q.How big does it get?
- A.Adult size ranges widely from about 30 to 110mm, and large males can exceed 100mm. The degree of mandible development adds to the striking, powerful look of bigger individuals.
- Q.Are there any legal restrictions on importing or keeping this species?
- A.The Sumatran Giant Stag Beetle is not subject to CITES.
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