Fig 2. Behavioral scores of focal-workers for later binomial classification as being aggressive or not.

Social focal-workers were examined with respect to behaviors that mainly or exclusively occurred in encounters with non-nestmates. If one of the following behaviors: 'biting', 'flexing gaster' or 'fighting' occurred at least once during any encounter, the focal-worker was classified as being aggressive. Otherwise, the focal-worker was classified as non-aggressive. Scale bar: 100% prevalence of a behavior in at least one of the encounters during a trial.