Formica lemani

This single-queen wood ant from France is one of the more productive Formica you can keep. It founds with one queen, then builds toward a sizeable worker force, so you get the classic single-queen story with real scale at the end. It is a cool-climate ant that needs a proper winter rest, which keeps it close to its natural rhythm and is the main thing that lifts it to Intermediate. Workers are active foragers that quickly learn the arena, and the colony rewards a keeper who is comfortable managing humidity and a long hibernation.

An omnivore that feeds its brood on captured insects while the workers run on honeydew gathered from aphids. Keep a sugar source available at all times and offer protein two to three times a week to keep the larvae developing.

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

Found this hardy northern ant in a test tube or small starter nest, then upgrade to an aerated concrete or acrylic nest once the founding chamber is packed. Lean the nest slightly moist rather than wet, with a damp brood corner and cooler walls elsewhere, since this species favours a cool room. Worker numbers can head high, so plan for room as you go. Use fluon (PTFE), oil, or talc and water to stop escapes. ANTonTOP formicaria and starter kits cover the full path from founding tube to a big nest.

Lean cool with this one: nest at 18-24 °C, arena at 20-26 °C, with humidity at 55-70% in the nest and 45-65% in the arena. Warm just one end to set a gradient so the ants can choose their temperature and humidity. The winter rest is long and non-negotiable here, a full 5 months at 5-10 °C that this hardy northern species depends on to thrive.

Development sits at a medium pace, but one strong queen can carry the colony toward 10,000 workers over several seasons. Early progress is slow before the worker force builds and the nest starts to fill out. You receive the queen with workers and brood, set to build steadily into a larger nest.

• Formica lemani is the cold-adapted close relative of F. fusca, replacing it across higher altitudes and cooler northern ground where few other field ants persist.
• The two look so alike that they were long confused, and lemani is separated mainly by fine details of body hair, a reminder of how subtle Formica taxonomy can be.
• Like all Formica it lacks a sting and defends itself with sprayed formic acid.
• It tends aphids for honeydew and, like its relatives, can act as a host species for brood-raiding parasitic ants.

Is Formica lemani good for beginners?

It is Intermediate, so it suits keepers who have already managed humidity and a winter rest at least once.

Does Formica lemani need a winter rest?

Yes, a winter rest at 5-10 °C for 5 months is mandatory.

Does this cold-hardy northern ant sting or bite?

No. It has only a mild, harmless bite.

How big does the colony get?

Up to 10,000 workers in a mature colony.

How large is the queen against her workers?

The queen is 8-10 mm; workers are 4-7 mm.

How fast does the colony grow?

At a medium development rate, with steady scaling thanks to a strong single queen.

What does it eat?

Sugar water or nectar or jelly for energy plus insects like crickets and flies for protein.

Will it arrive alive?

Yes, the queen ships with workers and brood and a heat or cool pack, sent within 24 h 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.