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Fig. 5. Oxygen consumption fluctuates during a song bout. Longer song bouts showed oxygen consumption rate (O2) oscillations (top) that corresponded to motif repetitions in the pressure pattern (P). The first of the five motifs has the highest peak in O2. The level of the O2 peak lowers for each subsequent motif until stabilizing at the end. Broken vertical lines represent the beginning of subsequent motifs.