Formica cunicularia

This wood ant gives you the classic single-queen story with real scale waiting at the end. Foragers are quick and firmly day-active, swarming food and learning the arena fast, so there is plenty to watch as the nest fills out. As an omnivore it is easy to feed, taking protein and sugars without fuss. The one demand that lifts it above beginner level is the mandatory cool diapause it needs each year, which makes it a fitting choice for a keeper who wants an energetic single-queen colony and can manage a proper winter rest.

An omnivorous forager that hunts insects to feed the larvae and works honeydew from aphids for its carbohydrate fix. Keep sugar available at all times and add protein two to three times a week to push brood growth.

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

Found the colony in a test tube or small nest and move it on once the founding workers blanket the floor. A dry-leaning nest in aerated concrete, acrylic, or sand suits this temperate forager, with one damp pocket kept aside for brood. Plan for a large arena, since worker numbers can rise into the thousands. The species is a quick climber, so seal the rim with fluon (PTFE), oil, or talc and water. ANTonTOP formicaria and starter kits put the nest, arena and barrier together as one set for a growing colony.

Treat it as a warm, fairly dry temperate ant: nest at 20-25 °C, arena at 22-28 °C, with humidity at 50-65% in the nest and 35-55% in the arena. Warm a single end so the workers can settle along a gradient instead of one even heat. The winter rest is mandatory, a cool spell at 5-10 °C for 4 months every year that resets the colony’s yearly rhythm.

Growth is steady, with a full brood cycle of about 6-8 weeks, and from one founding queen the colony can build toward 10,000 workers given time and warmth. The size gap between the larger queen and the small workers stays clear as numbers rise. You receive the queen with workers and brood, ready to scale up in a roomy setup.

• It defends itself with formic acid sprayed from the abdomen rather than a sting, the trademark chemical weapon of the Formica genus.
• Workers tend aphids for honeydew, effectively keeping herds of sap-feeding bugs as a renewable sugar source.
• Formica of this group are classic ground-nesting field ants that bask their nests in the sun and move brood to the warmest chambers to hurry development.
• These ants are common host colonies that other, parasitic Formica species raid or take over, a key role in the genus’s tangled social biology.

Is this a good species for beginners?

It is rated Intermediate, mainly because it needs a proper winter rest and grows large.

Does Formica cunicularia need a winter rest?

Yes, a mandatory winter rest at 5-10 °C for 4 months each year.

Does this field ant sting or bite?

No, it has no sting, only a mild bite.

How big does the colony get?

Up to 10,000 workers.

How large is the foundress next to her workers?

The queen is 8-11 mm; workers are 4-6 mm.

How fast does the colony grow?

Steady, with a full brood cycle around 6-8 weeks once established.

What does it eat?

Sugar water or jelly for energy plus protein insects such as crickets and flies for the brood.

Will the ants arrive alive?

Each colony ships with a queen, workers, and brood plus a heat or cool pack, sent 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.