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Map of 33 European populations of L. humile sampled. Populations were assigned to one of two distinct groups based on the aggression tests: the main supercolony (●) and the Catalonian supercolony (○). In the population marked with asterisk, workers were heavily infected with mites, which affected the behavioral interactions. Consequently, this population was not included in the analysis of behavioral data. (Scale bar is 100 km.)
