Figure 3.

The number of trees visited in the novel environment (x-axis) and the reversal speed in blocks of 500 trials (y-axis). The reversal speed is the difference between the number of blocks to criterion (six blocks with a DR ≥ 0.80, with the last two blocks occurring consecutively) for the first set of reversal task and the number of blocks to criterion for the first set of the discrimination task. Lower numbers for reversal speed represent birds that learned the reversal faster. Open markers are females and filled markers are males.