Formica haemorrhoidalis

Large red and black ant, although colonies have very polymorphic worker castes. Some workers can be very small. Colonies are very large and nests are varied in structure, often affiliated with stumps and logs. Sometimes thatch is placed over the nest. Colonies defended very aggressively. Foraging workers often travel along long trails. The larger workers are generally more commonly seen foraging than are smaller ones. Species is found in wetter areas, not far from streams (Nonacs).