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Formica fusca
One of the most common European species but you'll rarely notice many of them. These fast-moving ants tends to operate on their own, many meters away from their well-hidden nest, usually in dry, open fields where most other species will have a hard time surviving. A very active small to medium-sized species with a lot of character and easy to keep.
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Messor aciculatus
A very easy to keep granivorous species. An East-Asian species, it lacks the typical majors of the European species though also slightly less thermophilic.
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Messor barbarus
As an very easy-to-keep granivore with big red-headed majors, this is often a popular choice among beginning ant-keepers. However, they are a very stress-sensitive species which makes them quite tricky unless they have enough workers (~50) and a few majors. Please keep this in mind when selecting a colony size.