Figure 2.

Experimental design for the Development experiment. Focal males (marked with a small dab of yellow paint) experienced either their preferred or unpreferred group size for one day (left) and observers measured their social experiences. Next, the same individual focal male was transferred to a new arena containing a naïve age-matched stimulus male. This second day (right) of the experiment provided information about how experience in preferred and unpreferred groups influenced later aggressive behavior in a novel social situation.