Messor structor

🐜 Technical Sheet – Messor structor

Scientific name: Messor structor
Common name: Harvester ant
Family: Formicidae
Origin: Southern and Eastern Europe, Western Asia

📏 Size

• Queen: 11–14 mm
• Workers: 4–10 mm (polymorphic)
• Soldiers: up to 10 mm

🎨 Coloration

• Dark head and gaster (black or dark brown)
• Thorax lighter, reddish or brown tones

🌡️ Temperature

• Optimal: 22–28 °C
• Can tolerate slightly lower winter temperatures

💧 Humidity

• Brood area: 50–70%
• Foraging area (aires de chasse): dry

🏠 Nest type

• Acrylic, plaster or Ytong setups
• Requires humidity gradient
• Needs seed storage space

🍽️ Diet

• Main: seeds (millet, chia, flax, canary seed…)
• Protein: insects (crickets, mealworms)
• Occasional sugary liquids

👑 Colony type

• Monogynous (one queen)

🐣 Development

• Claustral founding (queen does not need to feed initially)
• Moderate growth rate

⚙️ Behaviour

• Calm and easy to maintain species
• Very active seed foragers and storers
• Capable of grinding seeds into “ant bread”

🛡️ Difficulty

• Easy – ideal for beginners

⚠️ Notes

• Avoid excess humidity in seed storage
• Requires light hibernation (10–15 °C for 2–3 months)
• Produces waste areas that must be cleaned