Figure 1. Aggression level per worker in α-workers and β-workers in 5-day-old workers.

Workers were kept in queenless groups of 3, 5 and 10 (12 groups for each group-size). Each group was observed for a total of 120 minutes. Data are presented as mean ± SE for the α-workers and β-workers in each group. Different letters denote statistical differences using two-way ANOVA test.