The discreet one of the undergrowth
Formica fusca, nicknamed the “slave ant” (or silky ant), owes its name to being regularly enslaved by other slave-making Formica species (Polyergus, Formica sanguinea). In the wild, it lives in modest colonies in the undergrowth, under stones and in stumps.
Far more peaceful than the other Formica, it’s an ideal species to start with the Formica genus before moving on to more impressive species such as Formica rufa or Formica pratensis.
Formica fusca is the species parasitised by the famous Polyergus rufescens, the slave-making Amazon ants. In the wild, spectacular raids are organised to steal Formica fusca pupae, which become the “slaves” working in the Polyergus nest.
Founding and first workers
Nuptial flight in June-July. Founding is claustral and the first workers appear in 6 to 10 weeks. The queen is matte black with a slightly reddish thorax, which can cause confusion with other Formica.
Keeping
An easy, undemanding species. It enjoys insects (fruit flies, mealworms) and sugary foods (honeydew, 10% sugar water). Long hibernation (4-5 months) at 4-8°C, essential for a good start to the cycle.
Modest growth
Unlike the explosive species, Formica fusca stays modest: 500 to 2000 workers at most. That makes it a perfect species for discreet, observable keeping, without having to manage a massive population.
Test tube 18x180mm
A slightly larger format, suited to Formica queens that need a bit more room.
Frequently asked questions
- How big is Formica fusca?
- Queen: 9-11 mm — Workers: 4-7 mm.
- How long does a Formica fusca queen live?
- A Formica fusca queen lives approximately 15-20 years.
- How does Formica fusca found a colony?
- Foundation type: Claustral — Polygynous: No.
- What does Formica fusca eat?
- Diet: Honeydew, insects.
- Does Formica fusca need a diapause (hibernation)?
- Diapause: Yes (4-5 months).
- What temperature and humidity does Formica fusca require?
- Temperature: 20-25°C — Humidity: 40-60%.
- How large does a Formica fusca colony grow?
- Colony size: 500-2000.
- Is Formica fusca suitable for beginners?
- Difficulty level: 1/5 (beginner).
Sources & references
Authoritative references for further reading on Formica fusca:
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