Laboratory and field observations of attack by the red wood ant Formica lugubris Zett. On Formica cunicularia Latr. (Hymenoptera: Formicidae)

Attack by red wood ants (Formica lugubris Zett.) on an “alien” species (Formica cunicularia Latr.) was analyzed both in the laboratory and in the field. Elements of such attack were recorded. Attack and conflict were observed in each encounter and follow immediately after the first contact. This overt attack was vigorous and generally led to the death of the alien. Laboratory data were confirmed by field observations, although under these conditions aggressiveness of F lugubris appeared increased possibly because of the animal's familiarity with its surroundings.