Fig. 5. Ingestive responses of individual caterpillars (N=10) to a range of salicin concentrations, both before and after exposure to the 157 mmol kg^–1 salicin diet. We calculated three ingestive parameters across each 2 min biting test: total intake, total number of bites and bite size. Within each panel, we determine whether the ingestive responses of the caterpillars decreased significantly with increasing concentration of salicin, both before and then after the exposure period. To this end, we make paired comparisons between the response to the control diet (i.e. 0 mmol kg^–1 salicin; open symbol) and that to each successively higher concentration of salicin (filled symbols) using the Wilcoxon matched-pairs signed-rank test (*P0.0125). All values are median ± median absolute deviation.