Kraatz's Stag Beetle

Kraatz's Stag Beetle key facts

Care level

Advanced

Lifespan

Adults 3-5 months

Size

Captive record 71.8mm for the nominate form, 62.7mm for the Vietnamese subspecies

Diet

Adults take beetle jelly; larvae eat fermented substrate

Temperature & Humidity

The related Japanese L. maculifemoratus lays readily when kept below 25C, and cool rearing is said to suit bringing out large beetles. Keep the substrate at a moisture that forms a ball when squeezed.

Breeding & Egg-laying

The BE-KUWA 2025 edition gives two captive records: 71.8mm for the nominate form (Ryo Yamada, registered 2024; wild 69.5mm, expected maximum 76mm) and 62.7mm for Vietnamese stock (Toshimasa Tsukahara, registered 2013; wild 71.0mm, expected maximum 78mm). Lucanus species have long larval periods and many rest after eclosion, so years can pass between egg-laying and an active adult.

Cohabitation

Adults are kept singly and put together only for pairing. Males fight with their mandibles and must always be separated. The subspecies reach different sizes, so keep Chinese and Vietnamese lines apart.

Lifespan & Rearing Period

Adults of the genus Lucanus are generally short-lived while the larval stage is long.

Health & Notes

It looks much like L. nobilis, so check the locality and the scientific name when buying. The captive records differ by subspecies, so avoid beetles of unknown origin. Importing foreign stag beetles falls under the Plant Protection Act, and whether a given species may enter depends on the country it comes from, so domestically bred stock is the safe choice.

About Kraatz's Stag Beetle

A stag beetle from southwestern China to northern Vietnam, similar to the Nobilis stag beetle but distinguished by features like its head projections. An advanced-keeper species with subspecies-specific size records.

7 things to know before welcoming a Kraatz's Stag Beetle

1. 1Best Suited to Experienced Keepers

   Kraatz's Stag Beetle is generally considered a species for experienced keepers. Prior experience with other Lucanus stag beetles makes it much easier to get a feel for temperature control and breeding setups. If this is your first stag beetle, it's worth building up basic skills with an easier species first.

2. 2Two Subspecies, Two Personalities

   Kraatz's Stag Beetle includes a nominate subspecies from China and a separate subspecies from northern Vietnam, and captive breeding records differ between the two. Since their overall look varies slightly, it's worth checking the subspecies and origin when you bring one home.

3. 3Telling It Apart from Nobilis

   This species closely resembles the Nobilis stag beetle, but the shape of the ear-like projections on the head, among other features, sets them apart. Comparing the two side by side is part of the fun of keeping Kraatz's Stag Beetle.

4. 4Prefers Cooler Conditions

   Like other Lucanus stag beetles, this species tends to be sensitive to heat and does best in cooler surroundings. Keep the enclosure out of direct sunlight and away from heat and humidity, in a well-ventilated spot.

5. 5Calm but Handle with Care

   Kraatz's Stag Beetle is generally considered relatively calm and easy to manage. That said, its mandibles can pinch if handled carelessly, so take care whenever you pick it up.

6. 6Setting Up the Enclosure

   Before your beetle arrives, prepare a case with insect substrate along with a perch or piece of bark so it has something to grip and right itself. Choose a case sized appropriately for the beetle and keep an eye on humidity so it doesn't get too damp.

7. 7Build a Health-Check Habit

   After bringing your beetle home, get in the habit of checking for chipped legs or mandibles and watching for sluggish movement. Lucanus stag beetles can be more sensitive to environmental changes than some other species, so avoiding sudden temperature swings helps keep them healthy.

Frequently asked questions about Kraatz's Stag Beetle

Q.How long do Kraatz's Stag Beetles live?

A.There isn't a well-established lifespan figure for this species yet. Because it can vary with the individual and its care environment, it's a good idea to keep an eye on day-to-day changes in its condition.

Q.Is this a good beetle for beginners?

A.Kraatz's Stag Beetle is generally considered a species for experienced keepers. If you're new to keeping stag beetles, it's worth gaining some basic experience with an easier species first.

Q.How is it different from the Nobilis stag beetle?

A.The two look quite similar, but differences show up in features such as the shape of the ear-like projections on the head. Comparing them side by side makes it easier to appreciate what sets each one apart.

Q.How large does it grow?

A.Captive breeding records show up to 71.8mm for the nominate subspecies from China and up to 62.7mm for the subspecies from northern Vietnam. Size tendencies differ noticeably between the two subspecies.

Q.Are there any legal restrictions on buying this species?

A.Kraatz's Stag Beetle is not subject to CITES.

Useful tools for Kraatz's Stag Beetle care

Learn more about Kraatz's Stag Beetle in the encyclopedia

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