Lasius alienus

• Queen: 7–9 mm
• Workers: 3–5 mm

• Insects: fruit flies, roaches, mealworms, small crickets
  • Sugar sources: sugar syrup (4:1 water to honey or sugar), honey
  • Soft fruits: apple, pear, grape
  • Protein jelly (formicarium-safe)
  • Tiny portions of cooked, unseasoned egg or fish
  • Readily scavenges dead insects — clean up leftovers to prevent mold

💡 Lasius alienus are active surface foragers, unlike their cousin Lasius flavus. They respond quickly to protein and sugar sources, especially during warm periods. Maintain a balanced diet to support healthy brood development.

• Humidity: Arena: 40–60% | Nest: 50–70%
• Temperature: Arena: 20–28 °C | Nest: 22–26 °C
• Diapause recommended: 2–3 months at 5–8 °C during winter (improves longevity and brood cycles)

Lasius alienus is a widely distributed Palearctic species, ranging across Europe, parts of North Africa, and western Asia. Often confused with Lasius niger, L. alienus tends to be slightly more slender and has a lighter brownish hue. It is especially common in dry grasslands and sandy habitats, where it nests under stones or in loose soil.

This species is visibly active, especially in warm conditions, with fast and coordinated foraging. Colonies are relatively easy to manage and grow at a moderate pace. Queens are hardy and long-lived, with colonies thriving for over a decade under proper care.

They adapt well to acrylic nests, test tube setups, or naturalistic terrariums. Their preference for drier soils makes them tolerant of slightly lower humidity compared to forest-dwelling Lasius species.

Lasius alienus is a dynamic and adaptable European species, ideal for hobbyists who enjoy watching above-ground activity and structured colony behavior. Their moderate growth, ease of care, and distinct field-ant personality make them a satisfying choice for both beginners and intermediate keepers. They are an excellent bridge between subterranean species like L. flavus and more aggressive, faster-growing genera.