Fig. 4.

Linear regression of frequency, variety, and dynamism of interactive behavior against evolutionary distance. The mean value of attributes from all observational episodes (n = 5–6) for each species were plotted against evolutionary distance to generate the best fitting line (bold dashes) with 95% confidence bands (light dashes) for its slope. The slopes did not differ from zero for (a) frequency (slope = −0.0008, F = 0.0082, P = 0.928), (b) variety (slope = 0.0010, F = 0.0027, P = 0.960), or (c) dynamism (slope = 0.0067, F = 0.741, P = 0.410).