Carebara affinis

The draw of this marauder ant is its caste range on a single trail: minuscule minors working shoulder to shoulder with far larger majors, a contrast few species can match. It is round-the-clock active, foraging by day and night, which keeps the colony engaging once it scales up. Coming from the humid forests of South and Southeast Asia, it demands constant warmth, high humidity and a properly tight, escape-proof setup. Rated Pro, it rewards an expert who already knows their way around demanding tropical ants.

A marauder that pours most of its effort into insect protein, the fuel its huge brood demands, while a steady sugar source keeps the foragers running. Protein matters most here, with sweet liquids alongside it.

★★★ readily · ★★ moderately · ★ occasionally · ✗ not eaten

Found this colony in a humid test tube or small damp nest and keep it sealed tight, because the minors are barely 2 mm and slip through the finest gaps. As numbers build, upgrade to a larger moisture-holding nest with very fine, secure connections, since this species swells into the tens of thousands. Run an arena barrier of fluon (PTFE), a fine oil line, or talc and water, and recheck it often. ANTonTOP formicaria and starter kits offer humid, tightly sealed builds sized for a colony this large.

These forest ants want it warm and humid, so keep the nest at 25-28 °C and the arena at 25-29 °C, holding nest humidity high at 70-85% and the arena at 50-70%. Offer a warm-to-cooler run so the colony can choose its spot, and never let the nest dry out. There is no hibernation for this tropical ant, so keep conditions stable and feeding all year.

Founding is slow, then growth turns sharp once the first workers arrive, the colony heading toward as many as 50,000 workers. It reaches you as a fertilised queen with workers and brood, past the delicate founding stage.

• Carebara are famous for one of the most extreme size gaps in the ant world, with minute minor workers beside far larger soldiers and a huge queen.
• The marauder ants in this group hunt in coordinated columns, swarming over prey too big for any single worker and carving it up together.
• The tiny minors are so small they often ride on the bodies of nestmates and on carried food, hitching a lift to and from the raid.
• Carebara now includes the old genus Pheidologeton, the classic marauder ants of tropical Asia.

Is Carebara affinis good for beginners?

No, it is rated Pro and needs steady tropical conditions, so it suits experienced keepers.

Does Carebara affinis need a winter rest?

No, this tropical marauder takes no hibernation; keep it warm and humid year-round.

Does Carebara affinis sting or bite?

Yes, it has a sting alongside a mild bite, so handle with care.

How big does the colony get?

Up to 50,000 workers.

How large is the queen?

The queen measures 16-18 mm.

How quickly does the colony build up?

Slow at founding, then fast once the worker force builds.

What does it eat?

Mostly insect protein for the brood, plus a constant sugar source.

Will it arrive alive?

Each colony ships with a queen, workers and brood plus a heat or cool pack, dispatched within 24 hours with tracking.

Escape prevention. Coat the inner rim of every open arena with fluon (PTFE), or use talc-and-water or an oil barrier as a backup, and keep a tight, fine-mesh lid on top. Check the barrier regularly, since dust, condensation and feeding debris break a fluon line over time. Keep tubing connectors tight and seal any gaps in the nest.

Keeping reminders. Always offer fresh water and never let the nest dry out completely. Give carbohydrates continuously and protein a few times a week, and remove uneaten insect prey within 24 hours before it moulds. Keep the formicarium out of direct sunlight and away from constant vibration, which stresses a young colony. A water-filled test tube plugged with cotton makes an ideal spare incubator whenever you need one.

Before you buy – do not rehouse too early. Have a test-tube setup or a small formicarium with an outworld and a working barrier ready before your colony arrives. A founding colony grows slowly at first, which is normal. Moving a small colony into a large nest too soon invites mould, mites and stress, and the workers die off one by one. Keep the colony in its open test tube on the arena, plug the nest entrance with cotton, and open up the next chambers only once the colony fills roughly 10-15% of the space.

What we ship. Every colony ships with a live-arrival guarantee, backed by our 24h unboxing-video guarantee: if the queen does not arrive alive, we reship free. Parcels travel with DHL, InPost (PL) or EMS, with a heat or cold pack to suit the season, packed discreetly and securely. We ship across the EU and worldwide, with free shipping over the Europe threshold.