Monomorium chilense

If you cannot run a warm nest, Monomorium chilense is a rare gift: it is comfortable across a notably cooler range than most of its genus, so an ordinary room often does the job without extra heating. Its multi-queen colonies build steadily and tolerate the loss of a single queen, which keeps the setup dependable. It comes from Chile in South America and asks for very little. The workers are easy to follow in the arena, and the whole colony makes an undemanding, reliably beginner-friendly small species.

A small omnivore. Workers run the colony on sugars and bring small insects back to feed the brood, so keep a sugar source out at all times and add protein through the week.

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

Found the colony in a test tube and seal it well against escapes from these small workers. Once the first nanitics carpet the floor, move them into a humid plaster or acrylic nest with a gap-free fit, keeping the arena a shade drier. As it runs cooler than most, a little gentle heat on one end keeps brood ticking over. Upgrade and connect modules as numbers climb. Run a fluon (PTFE) barrier round the arena; oil or talc-and-water work too. ANTonTOP formicaria and starter kits supply a matched nest, arena and barrier for a young, growing colony.

Built for cooler rooms, it sits at nest 18-24 °C and arena 20-26 °C, with nest humidity at 60-75% and the arena at 50-65%. A gentle heat on one end helps if the room runs cold, giving the colony a gradient to choose from. No hibernation is needed, so the ants stay active year-round on steady feeding.

Multi-queen colonies build numbers at a steady pace, with the cooler range slowing them a little compared with warmth-loving Monomorium, toward up to 10,000 workers. You receive a fertilised queen with workers and brood, often with more queens.

• Its comfort at a notably cool nest of 18-24 °C reflects a Chilean range that is far from tropical.
• That low temperature tolerance makes it one of the easier small ants for a keeper without a heat cable.
• As a polygyne species it spreads the egg-laying across several queens.
• Monomorium are opportunists, taking sugars and small prey rather than specialising on any one food.

Is Monomorium chilense good for beginners?

Yes. It is rated Beginner and especially easy if your room runs cool.

Does Monomorium chilense need a winter rest?

No, hibernation is not required. Keep it active year-round with steady feeding and stable temperatures.

Does this cool-tolerant Chilean ant sting or bite?

It has a sting and a mild bite, but it is harmless in practice.

How big can the colony get?

Up to 10,000 workers, helped by multiple queens.

How large is the queen?

The queen measures 5-6 mm and workers 2.5-3.5 mm.

How fast does it grow?

Steadily, with cooler temperatures slowing it slightly compared with warmer Monomorium.

What does Monomorium chilense eat?

Sugar water and nectar or jelly readily, plus small insects for brood; it does not take seeds.

How is it shipped and will it arrive alive?

It ships as a queen with workers and brood, with a heat or cool pack, dispatched within 24 h with tracking for a safe live arrival.

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.