Chilean Stag Beetle

Chilean Stag Beetle key facts

Care level

Advanced

Lifespan

Under a month once active above ground

Size

Males 33-90mm, females 25.1-37.1mm

Diet

Adults take tree sap; larvae feed on decaying wood in the soil

Temperature & Humidity

It lives in Nothofagus temperate rainforest, cooler country than most stag beetles occupy, and is described as unable to survive without fairly low temperatures, with the margin for error narrow.

Breeding & Egg-laying

It is described as one of the hardest stag beetles now kept. Much of its biology is unknown, and the technique for taking it from egg to adult has not been established, let alone for maintaining a line; only a handful of eclosions have been confirmed in Japan. An import in February 2026, the first in twenty years, has raised hopes that a method will now be worked out.

Cohabitation

For all its delicate look it is short-tempered, very ready to fight and strongly territorial; its aggression is said to exceed even that of Dorcus titanus or Hexarthrius, and it attacks outright without the threat displays or sizing up those beetles show. Females fight one another as fiercely as males do, so every beetle is housed alone.

Lifespan & Rearing Period

Between the long cool season of its home and the ferocity of its fighting, the adult life is short: once it comes above ground it is said to live under a month. The larvae live in the soil.

Health & Notes

The species is regarded as rare and vulnerable, with a risk of population decline. The distance between Japan and its Chilean home means it is rarely imported as a pet at all, and much of its biology remains unknown. Importing live Scarabaeoidea requires the species identification certificate, and the beetles must never be released or abandoned outdoors.

About Chilean Stag Beetle

One of South America's largest stag beetles, with an iridescent reddish-brown body and males bearing elongated mandibles over half their body length. Active above ground for under a month; a rare species suited to experienced keepers.

7 things to know before welcoming a Chilean Stag Beetle

1. 1Advanced-Level Care

   The Chilean stag beetle is considered a challenging species to keep. Because it requires specialized knowledge of temperature and humidity control and breeding substrate selection, it's best suited to keepers with prior experience with exotic stag beetles.

2. 2Active Period Under a Month

   Adults remain active above ground for less than a month. Since the window for observing and enjoying them is short, plan the timing of acquisition and your care schedule accordingly.

3. 3Males' Long Mandibles

   In larger males, the mandibles grow remarkably long and slender, sometimes covering more than half the body length and lined with fine teeth. The degree of mandible development varies widely between individuals, making it one of the most striking features to watch grow.

4. 4Iridescent Reddish Body

   Except for the underside, the entire body has a reddish-brown base with an iridescent metallic sheen. The coloring shifts depending on the angle and lighting, so viewing it from different angles brings out its full beauty.

5. 5Wide Size Range

   Adult size ranges from 33 to 90mm in males and 25.1 to 37.1mm in females. Since individuals of the same species can vary greatly in size, check not just the size but also the overall condition of the beetle before bringing one home.

6. 6Adequate Enclosure Space

   Larger individuals need a correspondingly spacious enclosure. To avoid damage to the mandibles, make sure the setup prevents males from coming into contact with each other and provides enough room to move.

7. 7Research Before Bringing One Home

   As this is considered a species for experienced keepers, it's important to thoroughly research care requirements such as temperature, humidity, and breeding conditions beforehand. If anything is unclear, consult the seller or an experienced keeper in advance.

Frequently asked questions about Chilean Stag Beetle

Q.Is the Chilean stag beetle suitable for beginners?

A.The Chilean stag beetle is considered a species for experienced keepers. Since it requires specialized knowledge such as temperature and humidity management, first-time keepers should consult someone experienced before getting started.

Q.How large do they grow?

A.Adult size ranges from 33 to 90mm in males and 25.1 to 37.1mm in females. Males in particular show great individual variation, with larger males having mandibles that can account for more than half their total body length.

Q.How long can I observe them?

A.Adults are active above ground for less than a month. Because this window is limited, many keepers enjoy closely observing the day-to-day changes during this brief period.

Q.What does it look like?

A.Except for the underside, the body has a reddish-brown base color with an iridescent metallic sheen. Males are especially notable for their long, slender mandibles lined with fine teeth.

Q.Are there any legal restrictions?

A.The Chilean stag beetle is not covered by CITES. That said, it's still a good idea to check the seller's information regarding care and handling.

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