Fig. 7.5 (cont.). (b) Performance by four female rufous hummingbirds on the four feeder patterns. Vertical bars represent 95% confidence intervals and the broken horizontal line indicates chance performance. (c) Performance by six rufous hummingbirds on the quarters pattern. The pattern was switched to its mirror image after trial 30 (indicated by the solid vertical line). The dashed line represents chance performance. (Redrawn with permission from Sutherland & Gass 1995.)
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