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Fig. 6. (A) The volume of oxygen consumed during song (V) increases with duration (D) of song bouts (regression equation: V=0.437+0.00124D; r=0.797, F=64.409, P<0.0001). Different symbols represent data points from different individuals (N as in Table 1). (B) Individuals with a longer motif duration (d) consumed a larger volume of oxygen (v) per motif (regression equation: v=-0.210+0.0017d; r=0.9024, F=17.54, P=0.014). (C) Song oxygen consumption rate (s) is closely related to pre-song oxygen consumption rate levels (p) (regression equation: s=0.075+0.904p; r=0.967, F=529.02, P<0.0001). The broken line indicates equal values on the x- and y-axes.