Socotra Island Blue Baboon Tarantula: Info, Care, Pictures & More

The Socotra Island Blue Baboon Tarantula (Monocentropus balfouri) is an Old World breed found in Socotra, an island off the coast of Yemen. The powerful blue color of the SIBBT makes it a popular pet for people in the hobby. If you’ve seen pictures of this fantastic Old World tarantula and are considering getting one, here’s everything you need to know before deciding if it’s the best fit for you.

Socotra Island Blue Baboon Fact Sheet

Species NameMonocentropus balfouri
Family NameTheraphosidae
Common NameSocotra Island Blue Baboon, Blue Baboon Tarantula
CategoryOld World
Native LocationSocotra Island, off the coast of Yemen
Body Length2.5 inches (7cm)
Leg Span7 inches (18cm)
Growth SpeedMedium
Urticating HairsNo
SocialCan live together
DietCrickets, roaches, mealworms. Also feeds on small mammals/birds in the wild
Temperature~ 76°F
Life ExpectancyFemales, 12 to 14 years. Males, 3 to 4 years
Recommended Experience LevelIntermediate
Minimum tank size5 to 10 gallons


The Monocentropus balfouri, known in the hobby as the Socotra Island Blue Baboon Tarantula, is a terrestrial spider, opportunistic burrower. She’s described as being more relaxed than other Old World breeds; however, the fast movements and potent venom make her a bad fit for beginners. She can eat small birds if given a chance, but she’ll be happy to eat crickets and roaches in captivity.

Appearance of the Socotra Island Blue Baboon Tarantula

The SIBBT is often at the top list of beautiful spiders for tarantula enthusiasts. Her legs, and often her cephalothorax, display an electric blue color, while her abdomen shows a sandy coloration. Her body is covered with light-colored hairs that give her the appearance of being satin-soft to touch.

These spiders exhibit sexual dimorphism, so the females are different from the males. The males are smaller and are often brighter blue, while females tend to be light or grey-blue. However, these differences are too subtle to be used to identify the sex of a spider reliably. Therefore, the most reliable way to identify their sex is to check the inside of a molt.

Expected Cost of a Socotra Island Blue Baboon Tarantula

The cost of these spiders depends on the sex. An unsexed or adult male can be bought for as little as 60$. As they live longer, females can go for as much as 300$ in some cases.

The price also depends on whether you buy a sling or an adult tarantula.

Behavior and Temperament

Marc BRETHES, CC BY-SA 3.0, via Wikimedia Commons

The Socotra Island Blue Baboon Tarantula is known for being a communal spider. Several SIBBTs can share the same tank in captivity as long as they’re well-fed. This makes it easier to store and breed them, and it allows us to have a captivating huge tank with several specimens of this spider.

For an Old World breed, the SIBBT is also described as relaxed. Besides, she’ll sooner run and hide when she feels threatened than attack. Since this is an Old World Spider, she doesn’t kick out urticating hairs, but she makes up for it with fast movements and potent venom.

Her venom is considered painful but not lethal. However, if you know your way around tarantulas, the only moment you’re in actual danger of being bit is when the mature females have just laid their egg sack, and they’re protecting it. They’ll go straight to attacking at those times without displaying a warning stance first; therefore, caution is advised.

Caring for a Socotra Island Blue Baboon Tarantula

Temperature and Humidity

The Socotra Island Blue Baboon Tarantula lives in a tropical desert with temperatures over 64°F. It’s advisable to have them in captivity in an environment around 76°F and 60-65% humidity.

Some tarantula handlers struggle to keep the humidity at adequate levels. To raise the humidity you can try spraying the substrate. Alternatively, an oversized water bowl will increase the humidity through evaporation.


These spiders are terrestrial opportunistic burrowers, which means that spiderlings should get at least three inches of substrate, and both juveniles and adults should have four inches as a minimum.

They need a soft substrate for burrowing, and it can be on the dry side rather than moist, so a mixture of peat moss and coconut fiber works well for them.


Adults should be kept in three-gallon tanks tall enough to allow their substrate. These opportunistic burrowers will be more comfortable if they have plenty of hiding places, so add artificial plants, bark, moss, and whatever you prefer as decoration. This will also help them make their webs, which is essential for their comfort.

If you’re going for a communal approach, the tank will be bigger but only slightly. These spiders don’t need three gallons each; they can be reasonably close to each other as long as each has its own space to have a web and burrow.


The Blue Baboon Tarantula grows at a medium growth rate. However, they will molt quite frequently when they’re young because that’s when they grow the fastest. Molting is the process of them shedding their exoskeleton to make way for a bigger one.

Before they molt they might refuse food or water for a few days. Do not disturb your tarantula during the molting process as it’s quite a stressful time for them.


Keeping your SIBBTs hydrated isn’t difficult. You can use a water dish and refill it as soon as it gets empty. However, since these spiders produce plenty of webs, it may be uncomfortable to reach the plate.

You can also take a different approach and spray their webs with water every two or three days; that’ll also keep them hydrated; just make sure you do it with every specimen’s web if you have several living together.

Diet of a Socotra Island Blue Baboon Tarantula

The SIBBTs are large enough to prey on small birds in the wild, but it’s enough and comfortable to use crickets and roaches to feed them in captivity.

Spiderlings should get a flour beetle or a flightless fruit fly twice a week. Once they reach ½ an inch, you can start feeding them with one or two small crickets every five to seven days.

These spiders won’t eat if they don’t need to, and are known to stop eating for weeks before molting, so make sure to check after you feed them and remove any uneaten food they may have left. You should also wait five days after the molt to resume feeding them.

Juveniles could eat two medium crickets or one small roach every seven to ten days. Adults should be fed a larger roach or four to five adult crickets every ten to fourteen days. You should wait seven days after a juvenile or adult has molted to attempt to feed them again.

If you’re considering having several spiders in one tank, you may be lucky to see them sometimes sharing food. This only means that you need to be more aware that each specimen is getting enough food.

Insects that Socotra Blue Baboons can eat ✔️
  • Grasshoppers
  • Beetles
  • Crickets
  • Caterpillars
  • Mealworms
  • Roaches
  • Silkworms
  • Superworms


Breeding SIBBTs is easy; just make sure they’re correctly fed and under environmentally ideal circumstances. Don’t attempt breeding until six weeks after the female has molted, or else you risk the eggs being unfertilized. The female will start making the egg sack around two months after meeting; you’ll notice because she’ll stop leaving her burrow. In this case, it’s better to leave the egg sack with the mother so she can take care of the eggs until they hatch.

Do note though that breeding is a complicated process and that tarantulas can have hundreds of slings at a time. If you don’t know what you’re doing, you might end up with hundreds of unwanted large spiders than can be difficult to find good homes for. Only breed spiders if you’re absolutely sure that you know what you’re doing.

Final words: Is the Blue Baboon the right tarantula for you?

If you’re considering going into the Old World breeds, these spiders are a great transitioning point between New World and Old World thanks to their docile nature. This, combined with their unique appearance and ability to live with other members of their species makes them a very interesting spider to care for.

We hope this guide helped you make the best decision for you with all the tools at hand.

Jesse A.