Fig. 5

Comparisons of a flight power (N), b mass-corrected power (W/kg), and c mass-corrected power cost per 100 km (Wh/kg) at a range of possible speed for Passer montanus (Eurasian Tree Sparrow, TRSP, n = 13) and Fringilla montifringilla (Brambling, BRAM, n = 8). All points represented individuals; polynomial curves are used to fit the trends of each species