Fig. 2. The effect of social experience is not affected by the number of siblings, but changes with exposure during the days preceding the test. Four same-age siblings were grouped with the tester male during social exposure unless noted x2 (with one sibling; A–D), or x10 (with nine siblings; C,D). All tested flies were 5 days old B42/Di2 males. N=22–35, except B (76), C (73) and F (16). For all other parameters, refer to Fig. 1. P<0.01.