Relative consumption (per bee, over four days) of morphine (M) and pure sucrose solution (S)
for the control (c) (n=54) and the injured (i) (n=52) group of Experiment 2 (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. From Groening et al., (2017) Scientific Reports 7:45825.