Figure 4. The learning speed of the bumblebees for each experiment.
(a) The number of training bouts required before progressing to the testing phase; (b) the cumulative distribution of the proportion of bees that progressed to the testing phase given the number of training bouts. Experiment 3 is included for comparison, but is not directly relatable to Experiments 1 and 2 due to slightly different methods of obtaining scent-marks.