Box-and-whisker plots for bite rates inflicted in recipient colonies scaled by chemical distance. We scaled the mean bite rates by chemical distance between the intruders and the recipient colonies from populations of M. ravouxi, T. unifasciatus, T. nylanderi and T. rabaudi from Anduze (myr_an, uni_an, nyl_an and rab_an respectively), and of T. unifasciatus and T. nylanderi from Fontainebleau (uni_f and nyl_f respectively). Box plots show the median and 25-75% percentiles. Whiskers show all data excluding outliers outliers outside the 10th and 90th percentiles (circles). Figures under bars indicate number of tests. * P < 0.05, ** P < 0.01, *** P < 0.001.