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.

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