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Fig. 2. Estimated `apparent' flight muscle mechanochemical efficiency plotted
against body mass (kg) for 15 bird species during migratory climbing flights
(+). The wigeon is left out of the analysis as an outlier. The red regression
line is based on the biomechanical power output continuously available
(Pac) calculated using default values for
CD,par ranging from 0.25 to 0.4
(Pennycuick, 1989). The blue
regression line is based on Pac calculated using a value
for CD,par of 0.1. Estimates of efficiency for three species of
hummingbirds (
) are also plotted. Calculations and data sources as in
Fig. 1.
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