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Fig. 1. Estimated maximum aerobic flight muscle power (W) plotted against body mass (kg). Calculated maximum aerobic metabolic power input available to the flight muscles (P_met,fm) for 15 bird species studied by Hedenström and Alerstam (1992) during migratory climbing flights (+, green regression line) and for hummingbirds (small circles). Calculations of P_met,fm are based on measurements of heart mass and assume _O2max = 33M_h^0.88 (Bishop, 1997). Estimated maximum biomechanical power output available continuously from the flight muscles (P_ac) for the 15 migratory bird species (large circles, red regression line) calculated using Pennycuick's computer program 1A (Pennycuick, 1989, version 1.1) with default values for C_D,par ranging from 0.25 to 0.4. The blue regression line is based on P_ac calculated using a value for C_D,par of 0.1 for all species. P_met,fm (green crosses) and P_ac (red triangles) are also plotted for three species of hummingbird hovering at a respirometry feeder (Wells, 1993; Chai and Dudley, 1995). Values for M_h are taken from Magnan (1922) and Hartman (1961).

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