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A Mean number of biting events observed. Nests were scanned 60 times (every 3 min for 3 hours) for 5 days. B Mean aggression index (see text for definition) of workers fed with a mix of protein (5∶1 MIX, green error bars) or egg protein (5∶1 EGG, Blue error bars) encountering workers coming from the same or a different colony fed the same or a different diet. N = 4 experimental colonies of 200 individuals per treatment.
