EN
It is questioned whether a different degree of agressiveness. of Formica species will lead to a different type of lesions of their victims and if so whether dissimilar lesions, caused by two related (Formica species Formica rufa and F. polyctena), might give support to their morphological separation. Moreover it is discussed if the conclusion is justified that an ant species is able to recognize other ant species if it causes dissimilar lesions during aggressive encounterls.