Figure 2. Relative consumption (per bee, over four days) of morphine (M) and pure sucrose solution (S) for the control (c) (n = 51) and the injured (i) (n = 49) group of Experiment 1 (n = number of cages).

Mean and median values are represented by red dots and horizontal black lines, respectively. There was no significant difference in the relative consumption of the two solutions between the injured bees and the controls (see Supplementary Table S2).