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Characterization of behavior (Prosocial, dark blue; Aggressive, dark gray; Nonsocial, light gray) during 10 min exposure to a novel, same-sex conspecific. Males of all ages spent significantly more time engaging in prosocial than aggressive behavior. However, only PND15 males spent significantly more time being prosocial than nonsocial. PND30, PND45, and PND60 males spent significantly more time being nonsocial than prosocial.
