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Mean time required by the ants to find for the first time the feeder (black bars) (ANOVA: F2,20 = 0.031, p < 0.05) and mean number of ants present in the arena during the first 3 min of the trial (grey bars) (ANOVA: F2,20 = 0.038, p < 0.05) throughout the three weeks during which the experiments were performed.
