Fig. 4

Comparisons of a flight speed (m/s), b flight power (W), c parasite drag (N), d Reynolds number, e mass-corrected power (W/kg), and f mass-corrected power cost per 100 km (Wh/kg) at maximum range speed (V_mr) and maximum speed (V_max) of Passer montanus (Eurasian Tree Sparrow, TRSP, n = 13) and Fringilla montifringilla (Brambling, BRAM, n = 8). All values depicted for each species are the means with standard error, * represents P < 0.05