Fig. 5. (A) Relationship between downwind approach distance d and nest-feeder distance D. Same data set as in Fig. 4. Dotted line indicates the best-fit regression (d=0.4D+0.56), thin lines mark 95% confidence intervals. Measurements for each individual were pooled before calculating means, S.D. and regression line. (B) Relationship between the scatter of the downwind approach distance d and the nest-feeder distance D. Same data set as in A and Fig. 4. The dotted line indicates a trend line (scatter_d=0.008D+0.443, values in m; a regression line was not constructed since the data points were not normally distributed, because the scatter was calculated as absolute values of the difference between d and the mean of d). 25% and 75% percentiles are given. The values for 40 m nest-feeder distance showed unusually high scatter, as a result of the experimental conditions; see text.