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Fig. 2. Results of the calibration experiment, which examined the relationship between the isotope elimination rate kc and O2 (diamonds, solid lines) or CO2 (squares, broken lines). (A) Sunbirds O2 (y=5.33x+0.19, r2=0.76) and CO2 (y=4.38x+0.29, r2=0.80) over a 10–20 min period after injection. In starlings (B) kc had to be corrected for body bicarbonate pool size (Nc), before regression against O2 (y=0.35x+1.11, r2=0.84), and CO2 (y=0.27x+0.54, r2=0.85), for the time period 15–30 min after injection.