Kokuwa Stag Beetle
The Kokuwa Stag Beetle is one of the most common small stag beetles found in woodlands across Japan. Males typically grow to 17-54mm and females to 21-33mm, giving them a compact but sturdy build and a famously calm temperament. Because adults survive the winter dormant, they can live for one to three years, unusually long for an insect. Active through summer, they settle into rotting wood or soil once the cold arrives, letting keepers observe their seasonal rhythm. Their hardiness makes them a great starting point for anyone new to keeping insects.
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Kokuwa Stag Beetle key facts
- Care level
- Beginner-friendly
- Lifespan
- Adult 1-3 years (overwinters as adult)
- Size
- Male 17-54mm / Female 21-33mm
- Temperature
- 18〜28℃
- Diet
- Beetle jelly, tree sap
- Temperature
- 18-28°C year-round; tolerant of heat and cold
- Overwintering
- Overwinters as an adult; can live 2-3 years
- Breeding
- Lays readily in rotten wood or fermented mat; easy to breed
- Temperament
- Gentle and calm; good for observation
- Collecting
- Found on oak sap and rotten wood from May to September
About Kokuwa Stag Beetle
A small, hardy stag beetle native to Japanese woodlands. Males reach 17-54mm and females 21-33mm, and adults can live one to three years thanks to winter dormancy, a beginner-friendly species.
7 things to know before welcoming a Kokuwa Stag Beetle
1Small enclosures work fine
Kokuwa Stag Beetles are small, so a plastic case around 20cm wide is plenty of room. Add a climbing branch to prevent them from getting stuck on their backs, and keep a generous layer of insect substrate for them to settle into.
2Adults overwinter as-is
In autumn, Kokuwa Stag Beetles burrow into the substrate or rotting wood and hibernate as full adults. During winter, mist the substrate lightly to prevent it from drying out and keep the case somewhere cool and quiet.
3Males are surprisingly calm
Despite their jaws, males tend to have a calm temperament and are generally easy to handle by hand. That said, keeping multiple beetles together can lead to fighting, so one beetle per case is the safer default.
4Insect jelly is the staple food
Store-bought insect jelly covers their nutritional needs, just keep one or two cups available at all times. If you offer fruit, remove it promptly since it spoils quickly and can foul the enclosure.
5Lives one to three years
Adults typically live one to three years, making them a beetle you can keep for the long haul. Their seasonal rhythm, active in summer, dormant in winter, gives you something new to observe throughout the year.
6Keep it indoors, temperature-stable
Avoid heat, humidity, and direct sunlight; a well-ventilated spot indoors is the standard setup. Choose a location that does not overheat in summer and will not freeze in winter.
7Prepare the enclosure in advance
Having the case, substrate, climbing branch, and insect jelly ready before your beetle arrives makes for a smooth transition. Lightly dampening the substrate before adding it makes ongoing care easier.
Frequently asked questions about Kokuwa Stag Beetle
- Q.Can I keep a Kokuwa Stag Beetle through winter?
- A.Yes, adults naturally hibernate through winter without special heating. Just keep the substrate from drying out and store the case somewhere cool and quiet.
- Q.How can I tell males and females apart?
- A.Males have large jaws and grow to 17-54mm, while females have much smaller jaws and reach 21-33mm. Jaw size and overall body size are the easiest ways to tell them apart.
- Q.What should I feed it?
- A.Standard insect jelly sold for beetles covers their needs. Keep one or two cups available at all times, and swap out empty or old cups regularly to keep the enclosure clean.
- Q.Is it okay to keep several together?
- A.Males in particular tend to fight when housed together, so keeping one beetle per case is generally recommended. If you do house them together, provide multiple hiding spots to help reduce conflict.
- Q.Can a beginner raise this species?
- A.Yes, Kokuwa Stag Beetles are hardy and low-maintenance, making them a beginner-friendly species. As long as you set up the basic enclosure correctly, first-time insect keepers can raise them without trouble.
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