How to Take Care of Stag Beetles (Kuwagata Mushi)

Stag Beetle, Kuwagata Mushi

Stag beetle // photo by GalToMassess

Stag beetles, known as kuwagata mushi in Japanese, are very popular as pets in Japan, much like rhinoceros beetles (kabuto mushi). Caring for stag beetles is much the same as caring for rhinoceros beetles, but, there are a few differences in how to care for stag beetles. Please enjoy!

Stag Beetle Care 

Stag Beetle Materials

  • Breeding case (Japanese: shiiku case) – just a normal animal aquarium, like what’s used for hermit crabs; usually plastic and cube-shaped. Be sure it is a type that will keep the air inside reasonably humid.
  • Bug bedding (konchuu matto) – if not planning to breed beetles, many types are okay, possibly even dirt from outside. For ease, though, store-bought beetle-specific bedding is recommended.
  • Food (esa) – 100 yen shops and home & garden stores sell special beetle jelly (konchuu zerii), in appetizing flavors such as black sugar, “protein,” and fruit (yum!).  Apparently, bananas, peaches, and apples are also good for beetles. Even though it’s traditional (at least in Japan), avoid watermelons and other water-heavy fruits.
  • Decaying branches, food dishes (kuchiki; esasara) – also sold at stores, although branches from outside are okay too; the branches give the beetles places to hide and the food dishes keep the beetle jelly from spilling onto the bedding.
  • Beetle humidifier (kirifuki) – beetles are very susceptible to drying out, so this spray (or, alternatively a sort of “water bottle”) helps keep their bedding moist. Also, keeping leaves (which can be store bought) in the case helps keep the soil moist.

Stag Beetle Care

  •  In Japan, stag beetles, as well as several other similar beetles, can normally be bought at home and garden centers, such as Cainz. Typically, it’s much easier to find them in stores during the summer, when they are in season. The typical price is from 300 yen to 2000 yen.  I’ve been told kids really enjoy catching wild beetles, but I’ve also heard it may be hard to find them; the wild beetle population has been dwindling because of loss of habitat.
  • Prepare a case before bringing your stag beetle home, or at least prepare it quickly after bringing your new friend home. Stag beetles will get stressed if kept in a small case.
  • As a base, put dirt or store-bought bug bedding in the case for the beetle. If the purpose isn’t breeding, 5 centimeters (about 2 inches) is fine.
  • On top of the insect bedding, place dried leaves, logs, and a food dish, all of which can be bought. Stag beetles will often fall over on their back, and things like sticks and leaves give the beetles something as a foothold to turn back over.
  • Stag beetles easily become dehydrated. You can use a store-bought spray beetle-specific spray (mentioned above) to keep the bug bedding moist. Be careful not to make the soil too wet — that would be inviting mold!
  • Stag beetles are sensitive to extreme temperature. They prefer 20 to 25 degrees Celsius (68 degrees to 77 degrees Fahrenheit). Don’t place them in direct sunlight — a shaded area is best, if outside. If you are keeping them indoors, a cool place such as under the shoe box (a common feature in Japanese houses) is recommended. Also, even though some beetles hibernate in the winter, do make sure not to let the temperature get too low either. Some websites advise using a thermometer for peace of mind.
  • Feed your beetle at least once a day. Then put in the branches and the food. To make sure that the jelly doesn’t make the bedding dirty, you can place it in a food plate. Be sure to change the food everyday, preferably in the evening, to make sure this nocturnal beetle has fresh food as he is waking up. Beetles also like fruits, such as bananas and apples. But avoid water-heavy fruits, such as watermelon, as it will hurt the beetle’s stomach. Also, try to be careful that the fruits don’t have pesticides on them, since stag beetles are, well, bugs. Water for drinking is unnecessary, as the jelly and fruits provide enough, but be sure to keep his/her soil moist — which leads to the next point.
  • Many stag beetles, both male and female, will fight and possibly kill each other if placed in the same case. Although in nature stag beetles often fight, if you keep one beetle per case, they will live longer, healthier lives.
  • Unfortunately, when stag beetles get sick, there isn’t much humans can do to help them. However, you can help prevent sickness by eliminating or at least reducing the beetle’s natural enemies, dani (mites/ticks) and nematodes. Beetles often have dani around their leg and body joints. You can use plain water and a toothbrush and a toothpick to pick these little white mites off of the beetle’s joints. Once you’ve done this, be sure to change the bedding, to prevent re-infestation. You can also buy dani-prevention sheets and special charcoal (kasseitan) to mix in with the dirt to prevent dani.
  • Last step: enjoy your new friend! 

Beetle Tips and Facts

  • Apparently, Japan-specific stag beetles are in danger of extinction, because of interbreeding with imported stag beetles and loss of habitat. So, if you buy a beetle, please don’t release it in the wild!
  • Only the males have the long, curved mandibles.
  • It may depend on the type, but stag beetles have been known to live up to 8 years! However, the average is 3 to 5 years.
  • Unlike rhinoceros beetles, stag beetles have a longer lifespan and thus hibernate during winter. Still, be sure to keep the temperature from going below freezing (which shouldn’t be a problem inside) and, since winter is often dry, keep careful watch on the moistness of the soil. Your beetle friend will burrow in the soil to sleep through the winter.
  • Some beetle keepers breed beetles in the winter, disrupting the beetle’s hibernation. This is very likely to shorten the beetle’s lifespan, so it is probably better to let your beetle sleep.
  • Stag beetles CAN bite with their mandibles. Be careful! Also, they are able to fly. 
  • These beetles don’t make noise, but the sounds of their scurrying can be a bit loud sometimes. For this reason, some websites advise that if you keep your beetle inside, that you don’t keep it in the bedroom.
  • The length of male stag beetles is typically from 32 mm to 82 mm (about 1.3 inches to 3.2 inches) and female stag beetles are from 30mm to 50 mm (about 1.2 inches to 2 inches)
  • The Japanese word “kuwagata mushi” means literally “hoe-shaped helmet crest bug.” This refers to the beetle’s long, curved mandibles looking like one of the traditional Japanese samurai helmets.
  • In English, these beetles are called “stag beetles” because their long mandibles resemble a deer’s horns.
I hope you found this article useful!


I am not a professional beetle caretaker or any kind of expert on stag beetles; just a fan. All of this information was compiled, translated, and arranged from the below sources.
If you’d like to know how to care for a rhinoceros beetle (kabuto mushi), check out this link.

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