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Frequency, Variety, and Dynamism of Volitional Behavior. Each data point was obtained during a 15-min observational episode, and reported per 15 min (a and b), or extrapolated to 60 min (c). Error bars show CI = 95% and horizontal lines mark the mean for each dataset. Evolutionary distance decreases roughly from left to right. Interspecies differences overall were significantly non-random for (a) frequency (P∼0.0001), (b) variety (P∼0.0006), and (c) dynamism (P < 0.0001).
