African Giant Black Millipede (Archispirostreptus Gigas)

Archispirostreptus gigas is the largest millipede on Earth — a substantial East African detritivore reaching up to 33.5 cm (around 13 inches) long and roughly 67 mm in circumference, carrying somewhere in the region of 256 legs that shift in number through its long life. Known across southern Africa as the Shongololo (Zulu and Xhosa) or Bongololo, and kept in zoos and education programmes the world over as the gentle ambassador of the millipede hobby, it's a genuinely impressive flagship invertebrate — and one of the few inverts that can comfortably share a decade of your life.

A note on what you're buying, because we'd rather be straight with you than not. The adults we have available now are wild-caught imports, as the overwhelming majority of A. gigas in the hobby are. This isn't us cutting a corner — it's simply the nature of this species. They breed slowly and take years to reach the size you see in the photos, so captive-bred adults are genuinely scarce across the whole hobby, not just here. The honest upside is that wild-caught gigas have a long track record of settling beautifully into captivity and living for years once they're in a stable, well-set-up enclosure. We're pleased to say we now have our own captive-bred babies coming through, but they won't be anywhere near a sensible size to rehome for a few months yet — so if you'd specifically like to wait for home-grown stock, drop us a message and we'll keep you posted. Otherwise, the wild-caught adults available here are healthy, settled, and ready to go.

This is a properly significant acquisition either way. Adults can live 7–10 years in captivity — far longer than most invertebrates — and reach a size that commands attention in any setup. The trade-off is that they need deep substrate, consistent humidity, and real space. Not a casual purchase. If millipedes are new to you, the beginner species in our millipede collection are a better first step before taking on a flagship like this.

Quick Care Summary

• Scientific name: Archispirostreptus gigas — genus described by Silvestri, 1895
• Common names: Giant African Millipede, African Giant Black Millipede, Tanzanian Giant Black Millipede, Shongololo (Zulu/Xhosa), Bongololo
• Family: Spirostreptidae
• Origin: East Africa (Mozambique through Kenya) and southern Arabia; lowland forest and coastal habitats below 1,000 m
• Adult size: 25–33.5 cm typical — the largest living millipede species in the world
• Lifespan: 7–10 years in captivity
• Legs: around 256 (varies across individuals and moults)
• Difficulty: Beginner to intermediate — forgiving once the setup is right, but the setup needs to be right from the start
• Temperature: 22–26°C (warm-preferring tropical)
• Humidity: 70–80% with a proper gradient
• Ventilation: Moderate — balance airflow against humidity retention
• Substrate depth: Minimum 15–20 cm — they burrow extensively to moult and shelter
• Diet: Detritivore — decaying hardwood leaves, rotting wood, fruit and veg
• Source: Wild-caught adults currently; captive-bred babies coming in a few months

What Makes the Giant African Millipede Special

The size is the headline. At up to 33.5 cm long and 67 mm around, this is genuinely the largest millipede species in the world — considerably bigger than most people expect from photos. A full adult is roughly the size of a generous courgette, and holding one for the first time tends to stick in the memory.

The longevity is unusual for an invertebrate. Seven to ten years puts A. gigas in completely different territory from most of the hobby. For comparison, a Powder Orange isopod lives 12–18 months and even long-lived Porcellio rarely pass three years. This is an animal that can be part of your household for the better part of a decade.

It carries real cultural weight. Across much of southern Africa these millipedes are the Shongololo or Bongololo — names that have followed the species into scientific literature. In many cultures they're treated as symbols of good luck and handled with respect rather than fear, which is a lovely bit of provenance for an animal you can keep on a shelf in the UK.

The temperament is famously docile. Unlike a lot of inverts, gigas is calm in the hand — which is exactly why zoos reach for them in education sessions. They don't bite or sting, and a settled adult will walk slowly across your palm exploring rather than bolting. Their main defence is simply to coil into a tight spiral, showing only the hard exoskeleton; the back-up is a pungent fluid from the body pores, harmless on skin but properly off-putting if you really provoke them.

They're a serious cleanup workhorse. A full-grown gigas processes leaf litter and rotting wood at a scale smaller species simply can't match. In a larger reptile or amphibian bioactive setup, a couple of adults handle real cleanup duty alongside isopods and springtails.

Setting Up the Enclosure

Don't undersize it. An adult needs genuine floor space — a glass vivarium or large plastic tub of at least 60 × 30 cm for a single millipede, more for a group. Horizontal floor area and substrate depth matter far more than height here.

Give them several hides: large pieces of cork bark, half logs, or ceramic caves. They'll spend a lot of their time tucked away or burrowed, and decaying wood pieces double up nicely as both hide and food. Keep the enclosure out of direct sunlight.

Ventilation should be moderate. Stagnant air invites mould, but aggressive airflow drops the humidity too far — cross-ventilation through mesh-covered holes on opposite sides strikes the right balance. Let the substrate do most of the humidity work; deep, damp substrate holds a gradient far more reliably than misting ever will.

One important husbandry point: don't give them a standing water dish. Gigas takes up moisture from the substrate, and open water is a drowning risk it simply doesn't need. A weekly mist of the substrate is plenty.

Substrate — The Critical Component

For this species substrate isn't bedding, it's the foundation of both diet and behaviour. Get it right and your millipede thrives; get it wrong and even a hardy animal struggles.

Aim for a minimum depth of 15–20 cm for adults. They burrow deep to moult — the most vulnerable moment in their life cycle — and shallow substrate is a leading cause of moult failure.

A reliable mix is roughly half decomposed hardwood leaf litter (oak, beech, magnolia — the dietary backbone), a fifth crumbled rotting hardwood soft enough to break between your fingers, a fifth pesticide-free organic topsoil, and the remainder split between a little sand or fine grit to aid digestion and a calcium source such as crushed limestone, cuttlebone, or eggshell. Avoid pine, cedar, and any other conifer entirely — the resins are toxic to millipedes, so it's hardwoods only.

Top the leaf litter up as they work through it; they get through a surprising amount and need constant access for proper nutrition. The Drygoods Mystery Box is a cost-effective way to keep substrate components, calcium, and supplementary food stocked.

Diet

Giant African Millipedes are detritivores with hearty appetites. The foundation is always-available hardwood leaf litter and soft, well-rotted white hardwood — between them these make up most of the diet. On top of that, offer fresh veg a few times a week (cucumber, courgette, sweet potato, carrot, squash, cut into decent pieces for their powerful jaws) and ripe fruit once or twice a week (banana, melon, apple, mango), going easy on the fruit because of the sugar. A constant calcium source — cuttlebone, crushed oyster shell, or limestone — is essential for maintaining that huge exoskeleton.

Don't offer animal protein as a routine; gigas is primarily a plant-detritus feeder and doesn't handle protein the way mixed-diet invertebrates do.

Humidity and Temperature

Keep humidity around 70–80% with a clear moisture gradient. The substrate should feel damp throughout — like a wrung-out sponge — but never waterlogged. A weekly surface mist plus the occasional deeper watering keeps it where it needs to be.

Target 22–26°C. UK rooms often dip below this in winter, so a low-wattage heat mat on a thermostat, mounted on the side of the enclosure rather than underneath, keeps a warm end without trapping the millipede against a hot, dry base. Avoid sharp temperature swings and keep the enclosure away from windows and radiators.

Handling

Done properly, gigas is one of the safest inverts to handle — no bite, no sting, and nowhere near fast enough to cause any bother. Let the millipede walk onto your hand rather than picking it up, support its full length rather than dangling it by one end, and keep sessions short (five to ten minutes is plenty). Wash your hands before and after, and leave them well alone while they're moulting or gravid.

Two defence behaviours are worth knowing. The first is the harmless spiral coil. The second is an occasional pungent yellow-orange secretion from the body pores when an animal is genuinely stressed — harmless on intact skin, but it can stain temporarily, so give your hands a thorough rinse if it happens. Most individuals never use it at all.

Breeding

Captive breeding is achievable but slow — which, as above, is the whole reason wild-caught adults still dominate the trade. Females lay eggs in clusters inside little cells they build from rotting wood and frass. Eggs take one to three months to hatch, and the juveniles then take two to four years to reach full adult size depending on warmth and feeding.

If you want to try, give them a stable 24–26°C, consistent humidity around 75–80%, deep substrate with plenty of rotting wood to lay into, generous calcium for breeding females, and several individuals together (sexing is difficult until maturity). Above all, patience — generation times here are measured in years, not months.

Who Should Buy a Giant African Millipede?

They're an excellent fit if you want a flagship display invertebrate with real presence, you're happy taking on a 7–10 year commitment, you're an educator after a calm handling animal, or you need serious cleanup capacity in a larger bioactive vivarium. They also reward anyone drawn to African natural history and the Shongololo story.

They're not the right choice if you're brand new to invertebrates (start with smaller, hardier millipedes from the collection first), you can only offer a small enclosure, you want a fast-breeding colony, or you're set on bold colour — these are a uniform dark brown to black, and the size and shape are the visual impact, not the palette.

Pair With Springtails and Drygoods

A complete setup usually pairs the millipede with a springtail culture for mould control in the humid enclosure, plus the Drygoods Mystery Box for substrate components, calcium, and food in one go. If you're building broader variety, the Millipede Mystery Box is a good way to add to the collection alongside your flagship.

Realistic Expectations

They get genuinely large. Picture adults of 25–33 cm and plan the space accordingly. Photos online sometimes show smaller juveniles; the animals here are properly substantial.

They live a long time. Seven to ten years is typical, so it's worth thinking honestly about whether your housing and circumstances suit a decade-long commitment.

They're slow, and that's the point. Don't expect scuttling or drama. Gigas walks slowly, eats slowly, breeds slowly, and lives calmly — the appeal is presence and longevity, not activity.

The colour is understated. Adults are dark brown to near-black with slightly lighter legs. Subtle rather than vivid — the scale is what draws the eye.

Substrate depth is non-negotiable. Give them 15–20 cm minimum from the outset; it's much easier than topping up later, and it's the single biggest factor in safe moulting.