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Fig. 3. Example of oxygen measurements during song from a canary. Song is shown as oscillogram (bottom panel). The segment indicated by the grey horizontal bar in this panel is also shown spectrographically in the top panel. The rate of oxygen consumption (O2) is shown in the central panel. Note that the peak in oxygen consumption at the end of the song bout (indicated by an arrowhead) was caused by movement of the bird in the respirometry chamber.