Carebara diversa: The Asian Marauder Ant — Wild Biology and Complete Care Guide

There are species that test how much an antkeeper can handle, and then there is Carebara diversa. A mature queen weighs three hundred times more than her smallest worker. A supermajor’s head is twelve times larger. A wild colony can hold a million ants. Raid columns are wide enough to look like a moving carpet on the forest floor, and the keeper guides that don’t carry warnings on page one should not be trusted.

This is the deepest dive on Carebara diversa we could put together in 2026. What these ants are in the wild, how the caste system really works, why hobbyists keep losing colonies in the first six months, and what a setup that survives a year actually looks like. If you’re thinking about buying a queen, read the whole thing first. If you already own one, jump to the setup and mistakes sections.

Browse Carebara diversa colonies in stock at ANTonTOP →

Quick answer

Carebara diversa is the most polymorphic ant species commonly kept in the hobby. Queens reach 25 mm and live 10–15 years. Workers range from 2 mm minors to 15 mm supermajors with crushing mandibles. Wild colonies hold 100,000–1,000,000 individuals and forage in dense raid columns. Captive keeping is rated expert-only: they need 27–33 °C, 70–90 % humidity, daily feeding, no hibernation, and they punish every gap in escape-proofing. Founding is semi-claustral; the first workers appear in about 28 days.

What is Carebara diversa?

Carebara diversa was described by Thomas Jerdon in 1851 from southern India. For most of the twentieth century it sat in a separate genus called Pheidologeton. The old name Pheidologeton diversus still shows up in older books and on a lot of forum threads. In 2014, taxonomists collapsed Pheidologeton into Carebara, and the modern name is what most current sources use.

The English common name is Asian Marauder Ant (sometimes East Indian harvesting ant in older literature). The “marauder” part refers to the species’ most famous trait: huge, organised columns of workers that sweep across the ground and overwhelm prey by sheer numbers, the way army ants do. Marauders are not actual army ants. They have permanent nests and the queens have wings and fly. But the parallel is striking enough that some early entomologists called them pseudo-army ants.

Native range

You find wild Carebara diversa across the warm parts of Asia:

• India and Sri Lanka
• Southern China (including Yunnan and Hainan)
• Thailand, Vietnam, Cambodia, Laos
• Malaysia and Indonesia
• Taiwan and the Philippines
• Japan (only the southern islands. Okinawa and the Ogasawara group, where some populations may have arrived by trade)

They live in tropical and subtropical lowland forest, plantations, and open soil at the edges of villages. They are completely absent from Europe in the wild, which is one reason keeping a colony at home is regulated as an exotic species in some EU countries. Always check local rules before buying.

The most extreme polymorphism in the ant world

Polymorphism, meaning more than one body size and shape among workers, exists in plenty of ants. Pheidole, Atta, Messor, Camponotus all do it. None do it on the scale that Carebara does.

In the same colony, you can find:

• Minor workers at 1.3–2.5 mm, pale reddish-brown, slightly translucent. Five-toothed mandibles. They look like a different species entirely.
• Major workers at 6–9 mm, darker, with broader heads and triangular jaws.
• Supermajors at 12–18 mm. Dark brown to black, head capsules so large they have to walk with their jaws slightly open, mandibles strong enough to cut beetle elytra in half.

Compared head-to-head:

• A supermajor’s head is roughly 12 times larger than a minor’s head.
• A supermajor weighs about 500 times more than a minor (M.W. Moffett, 1987 and 1988, the foundational papers on the species).
• They are, by mass, the most polymorphic worker caste known in any ant species. More extreme than the famous Pheidole or even the leafcutter Atta.

When you watch a feeding session, you see what this caste system is actually for. Minors disassemble small prey, ferry sugar water grain by grain, and clean the brood pile. Majors carry larger items and form the defensive ring around the column. Supermajors stand at the front of raiding columns and at chokepoints in the nest. Their crushing mandibles are not for finesse. They shear through cricket exoskeletons in a single bite and decapitate larger arthropods on contact. In captivity, a single supermajor will hold down a half-dead cockroach long enough for the minors to dismember it.

There is a smaller detail that catches every new keeper off guard the first time they see it: minors ride on top of majors. When a raid column moves, dozens of minors hitchhike on the head and thorax of a major to save energy and to be carried into prey-rich areas. It looks like a war movie and it is one of the most photogenic behaviours in the hobby.

The queen, or sometimes, queens

The Carebara diversa queen is one of the largest ant queens in the world. Reported sizes vary slightly across sources (Jerdon’s original 1851 description, later revisions, and modern hobbyist measurements), but a healthy laying queen reliably falls between 23 and 28 mm. The 25 mm figure that gets quoted most often is a good working number.

By body mass, she is about 300 times heavier than her smallest minor daughter. There is no other commonly kept ant where the ratio is that big. A Camponotus gigas queen, often called the queen of giant carpenter ants, looks petite next to her.

Her egg production is just as extreme. A laying queen can produce around 100 eggs per day under good conditions. That is part of why mature colonies push toward six and seven figures so quickly, and part of why captive colonies that survive their first year often start to outgrow whatever you bought to house them in.

Carebara diversa is also polygynous, meaning several queens can live and lay in the same nest. Field studies have found colonies with up to 16 queens. Some sellers in Asia offer multi-queen founding setups for this reason. In the EU market, single-queen colonies are the norm because they ship more reliably.

The queen herself lives 10 to 15 years if conditions stay stable. That alone is a serious commitment. Longer than most pet rodents, comparable to a parrot in workload.

Their nuptial flights happen in the rainy season. Near Bangkok, the schedule is roughly once per year. Closer to the equator (Sumatra, Borneo, southern Philippines), flights happen every three months because the wet season is permanent. The queens are so heavy that flight takeoffs are often clumsy. Jerdon’s original notes mention queens that “could scarcely fly,” and modern field observers report the same thing. For when European species fly, see our European Nuptial Flight Calendar 2026.

Marauder raids: how they hunt

The trait that gave the species its English name is the raid column. In a mature wild colony, you can stand at the edge of a forest path at dawn and watch a column of workers stream out of the nest, several centimetres wide, moving at about two to three metres per hour. Columns up to 100 metres long have been documented.

What makes the column more than just a foraging trail:

• Soil arcades. Workers build small earth tunnels and ridges along the column edges. These reduce predation and shield the column from sun and wind. In rainforest soil, you can sometimes still see the arcades the morning after the column has moved on.
• Pheromone discipline. The trail pheromone is potent enough that workers continue along it even when the column is broken. In one experiment, 94 percent of workers re-formed the trail after the path was obstructed.
• Carpet behaviour. When the column encounters a prey patch (termites, beetle larvae, fallen fruit), it widens into what looks like a moving brown carpet. Dozens of workers swarm a single insect simultaneously and disassemble it.

This is the behaviour that makes raid videos of Carebara so different from a Camponotus foraging trail. There is no decision-tree about what to attack. Whatever is in the column’s path becomes food.

In captivity, the carpet behaviour compresses into the arena. A colony of 200 workers fed five live crickets at once will produce a tight forager mass that swarms each cricket within seconds. It is one of the best feeding-show species in the hobby. It is also why a casual lid leaves you with crickets in the kitchen and supermajors on the wallpaper inside two hours.

Should you keep Carebara diversa?

Honest checklist before you click the buy button:

• ☑️ Can you keep the room at 27–33 °C year-round? Not “we have heating in winter”. The species cannot tolerate sustained drops below about 22 °C.
• ☑️ Are you willing to feed daily? A laying queen with 500 workers eats more than most beginners feed an entire collection in a week. Missing two days of protein can mean visible worker mortality.
• ☑️ Do you have a dedicated, sealed, ventilated formicarium that can scale into a setup holding tens of thousands of workers within 18 months?
• ☑️ Can you commit 10+ years to a queen who will keep laying as long as you keep her alive?
• ☑️ Do you have experience with at least one tropical species before this? Beginners who jump straight to Carebara lose their queens at a rate that is genuinely sad to watch on forum journals.

If any of those is a “not really,” start with a slower, more forgiving tropical species (we sell several easier exotics in Tropical Ants) and come back to Carebara once you’ve raised a colony to a few thousand workers without disasters.

If all five boxes are checked, you have one of the most rewarding species in the hobby in front of you.

Setup: the founding stage

In the wild, a freshly mated Carebara diversa queen lands, breaks off her wings, and digs a small chamber where she lays her first brood. She is semi-claustral, meaning she will occasionally leave the chamber to scavenge if food is available. In practice, captive founding queens stay sealed in their tube and you keep the chamber dark and stable.

Test tube founding setup:

• A standard 16×160 mm glass test tube is the gold-standard founding chamber for this species. The diameter gives the queen room to turn, and the tube is long enough to let you keep a generous water reservoir behind a cotton plug.
• Fill about a third of the tube with water, then push a tight cotton plug in. The plug stops the water from leaking but lets humidity diffuse into the chamber.
• A second cotton plug goes at the open end to seal the queen in.
• Keep the tube horizontal in a dark, warm spot. A drawer, tube rack, or cardboard sleeve all work.

Founding queens are easily stressed. Keep the tube undisturbed except for one humidity and brood check per week. Do not “just take a quick look” daily. Stress-induced brood loss is the single most common reason a Carebara founding fails.

Feeding the founding queen. Because she is semi-claustral, she will accept a small drop of sugar water or a tiny piece of insect (cricket leg, mealworm slice) every 7 to 10 days. Push it through the tube opening on the tip of a brush. Do not flood the tube with food. Protein left to rot is a faster killer than hunger.

When do you see the first workers? At a stable 28 to 30 °C, the queen lays her first egg cluster within a few days. Larval development takes roughly 9 days, pupal stage another 10 days. From the moment the first egg appears, expect the first minor workers in about four weeks.

Once you have 20 to 30 workers, move them. They are not ready for a full formicarium at 15 workers (some guides claim 15 is enough; it is too few for a colony that consumes resources this fast), and waiting until 100 is unnecessary.

Setup: the formicarium

The species needs three things from its main housing: stable deep humidity, escape-proofing, and room to grow fast.

The setups that work in captivity:

• Digfix or natural-substrate formicaria. A soil-and-clay nest that the colony will excavate. Carebara are powerful diggers and they actively enjoy a substrate they can shape. The downside is that you cannot see the brood. (Digfix formicaria selection →)
• Gypsum formicaria with a vertical chamber layout. Gypsum holds humidity well and is heavy enough that minor escapes through the lid edge stay rare. (Gypsum formicaria →)
• Acrylic-on-Ytong hybrids. Hobbyists with deep experience sometimes build these for the visibility, but they require an external humidifier and are not a setup we recommend for someone’s first Carebara.

Size. A colony of 200 workers needs at least a small-to-medium chamber footprint plus an outworld at least 25×15 cm. By month nine, you will need to be ready to add a second module. By month eighteen, you should be running a multi-module system.

Outworld. Keep the lid sealed with foam strips along the edges. Apply a fresh band of Fluon (PTFE) or talc-and-alcohol slurry to the upper 3 cm of the inside walls every six weeks. Minors will find every smudge and gap. We have seen colonies escape through a 0.6 mm gap in a Tupperware seal.

Ventilation. Cut at least two mesh-covered ventilation holes (3–4 mm steel mesh; minors push through fabric mesh). High waste production means an unventilated outworld grows mould within a month.

Heating, humidity, and climate

This is where most colonies die. Carebara diversa is not forgiving about climate.

Temperature:

• Nest target: 27–33 °C constantly. The brood develops fastest around 30 °C.
• Arena: 22–35 °C is acceptable.
• Day/night cycle: a gentle 33 °C day / 27 °C night cycle mimics their natural range and keeps activity rhythms healthy. Pure flat 30 °C also works.
• Lower limit: short drops below 22 °C cause noticeable brood damage. Sustained drops below 18 °C kill colonies. There is no hibernation phase to fall back on.

How to heat. A 12 V self-regulating heating cable under one side of the nest, controlled by a digital thermostat, is the right tool. Plain heating mats lack the precision and tend to bake the bottom of the nest. Place the heat source under one half of the formicarium so the colony can choose a thermal sweet spot.

If you have to use a heating mat at the start, run it through a thermostat probe in the nest, set conservatively to 30 °C, and upgrade to a cable as soon as the colony grows past a few hundred workers.

Humidity:

• Nest: 70–90 %. Deep humidity matters more than misting. A soil-based or gypsum nest with a charged water reservoir holds humidity better than an acrylic nest you mist daily.
• Arena: 60–80 %.
• Mist at least twice a day during the first six months. Use a fine atomiser; heavy droplets drown minors.
• Track it. A combined thermometer/hygrometer inside the outworld is the cheapest insurance you can buy.

Feeding the marauder

A Carebara colony eats. Not “feed a small piece of cricket once a week” eats. Actually eats.

Protein:

• Live crickets, dubia roaches, mealworm pieces, locust hatchlings.
• Tiny pieces of unsalted cooked chicken or tuna (use sparingly; protein left out grows mould fast).
• Fresh-killed (frozen-thawed) insects work as well as live ones for Carebara. The colony swarms them either way.

Carbohydrates:

• A continuous source of sugar is essential. The Energy Ant Jelly set is the easiest way to keep a stable sugar feed without spilling honey or syrup. We have seen Carebara arenas where workers walk a permanent loop between the brood and the jelly cup for days.
• Honey water (1:1) or 20 % sugar water in a small dish works as well, but spills attract mould.

Schedule:

• Founding queen: small protein once every 7 to 10 days, sugar drop once a week.
• 20 to 100 workers: small live or thawed insect every 2 to 3 days, sugar always available.
• 100 to 1000 workers: 3 to 5 prey items every 1 to 2 days, two sugar sources at once.
• 1000+ workers: daily protein, with consumption rising in step with the brood pile.

The “skipped day” warning. At the half-year mark and onward, missing one feeding day is visible. Missing two days starts killing workers. This is unlike most species in the hobby, which can buffer a vacation easily. Carebara keepers need an automated feeder, a sitter, or a partner who can manage a colony before any trip longer than 48 hours.

Growth timeline: month by month

This is the rough trajectory at stable 30 °C with adequate food:

• Month 1: 1 queen alone → first 5 to 15 minor workers visible.
• Month 2: 30 to 60 workers. First media workers (4 to 6 mm) appear in the brood pile.
• Month 3: 100 to 200 workers. Move to the main formicarium.
• Month 6: 500 to 1500 workers. First true majors (>8 mm) emerge.
• Month 9: 3000 to 6000 workers. The first supermajor head capsule shows up in the brood. A moment most keepers remember for years.
• Month 12: 10,000 to 20,000 workers, depending on feeding.
• Month 18: 30,000 to 60,000 workers. Multiple modules needed. The colony now eats more than most household terrariums.
• Year 3+: well past 100,000 if you have kept the colony fed.

These numbers are not guaranteed. They are what a well-fed, stable-climate captive colony tends to do. You can also stall growth on purpose by feeding less, which is what many keepers do to keep the colony manageable.

Six mistakes that kill Carebara colonies

The same mistakes show up on forum journals over and over. Avoid these and your odds of getting past month six rise sharply.

1. Heating mat without a thermostat. A bare mat under glass climbs past 40 °C in summer afternoons. We have read more than one journal that ended with a queen cooked in her own test tube. Always run heat through a thermostat. Always.

2. Founding-stage disturbance. Daily checks, moving the tube around, bright light on the queen. Founding queens have a stress budget and if you exhaust it, they reabsorb their brood and refuse to lay again for weeks. Leave them alone.

3. Minor escapes through a “sealed” lid. A Carebara minor at 1.5 mm goes through any gap a hair fits in. Foam-seal every edge. Re-apply Fluon every six weeks. Inspect the outworld lid weekly, especially after dropping food in.

4. Damp protein left out. Crickets that aren’t eaten within 24 hours start moulding in an 80 percent humid arena. Mould attacks the colony’s outworld surfaces and triggers respiratory issues. Remove uneaten protein after a day.

5. Mite infestations from uncleaned live food. Crickets bought from pet shops sometimes arrive with parasitic mites. Mites in a Carebara colony can wipe everything except the queen within two weeks. Quarantine new live food in a separate container for 72 hours before feeding.

6. Substrate that dries out. A gypsum or soil nest that has been allowed to dry, even once, can crack and lose its hygroscopic properties. A thirsty Carebara colony will start eating its own larvae before it dehydrates. Visible white piles disappearing is the early warning. Always keep at least one chamber humid and refill the reservoir every 7 to 10 days.

Carebara diversa vs other polymorphic species

How they compare to the other commonly kept polymorphic ants:

If you want the experience of a polymorphic species without the Carebara difficulty, Pheidole is the closest entry point. If you want the spectacle of huge workers at the cost of slower growth, Camponotus species are forgiving. Carebara is the species you graduate to.

Where to buy Carebara diversa in Europe

Two non-negotiables for buying this species:

• Health-certified queens with confirmed laying. A queen sold without confirmation of egg production is a coin flip. Many Carebara queens you’ll find on second-hand listings stopped laying months ago.
• Tracked shipping with a heat pack. Carebara in cold transit dies. Reputable sellers ship Monday or Tuesday only, in insulated packaging, with thermal packs.

We carry Carebara diversa colonies at ANTonTOP in single-queen and multi-queen variants ranging from a queen alone up to a queen with 1000 workers. Every colony ships from our Polish facility with InPost or DHL, with thermal packaging, and with our 24-hour unboxing video guarantee. If you’re new to the species, we recommend starting at the “queen + 50 workers” tier. Large enough that the colony’s first months in your home are stable, small enough that you can scale your setup as they grow.

A couple of buying notes:

• The species is not legally importable into some EU countries without permits. It is not on the strict invasive list, but customs in Norway, Switzerland, and the UK occasionally hold shipments. Check your country’s rules before ordering across borders.
• Beware of Carebara affinis sold as C. diversa. They look similar but affinis has a much smaller queen (~17 mm vs diversa‘s 25 mm). Reputable EU sellers won’t mix them up; second-hand listings sometimes do.

FAQ

Is Carebara diversa suitable for beginners?
No. The species needs constant warmth, very high humidity, daily feeding, and a sealed formicarium. Most beginner failures happen in the first six months. Start with a beginner-friendly species like Lasius niger, Messor barbarus, or Pheidole indica before attempting Carebara.

How big does a Carebara diversa queen get?
A mature laying queen is typically 25 mm long, with field measurements ranging from 23 to 28 mm. By body mass, she weighs about 300 times more than her smallest minor worker, one of the most extreme size ratios in the ant world.

Do Carebara ants need hibernation?
No. They are tropical and active year-round. Keep them at 27–33 °C constantly. Any sustained drop below 22 °C damages the colony.

What do Carebara diversa eat in captivity?
Live or thawed insects (crickets, roaches, mealworms), small pieces of unsalted cooked meat, and a continuous sugar source. Sugar water, honey water, or ant jelly all work. Mature colonies need daily feeding.

How long does it take to grow a large colony?
With stable climate and good feeding, expect 100 workers by month three, 1000 by month six, and 10,000+ by year one. Supermajors appear in the brood at around month nine.

What is the difference between Carebara diversa and Pheidologeton diversus?
None. They are the same species. Pheidologeton was merged into Carebara in 2014. Older literature uses the old name; current scientific work uses Carebara diversa.

Can Carebara diversa sting?
Yes. The species has a functional sting. Most stings are mild and feel more like a strong pinch from the supermajors than a true burn. Allergic reactions are uncommon but possible; handle the colony carefully.

How long does a Carebara queen live?
10 to 15 years in stable captive conditions. This is a long-term commitment. Longer than most rodents, comparable to a parrot.

Ready to start? Browse Carebara diversa colonies → · More tropical species → · Read: European Nuptial Flight Calendar 2026 →