Fig. 4. Breast muscle mass (lean dry mass) versus total body mass (fresh mass) in birds after a long-distance flight. Pied flycatcher, y=–0.102+0.056x (r²_adj=0.880, P<0.001, N=10); willow warbler, y=0.058+0.038x (r²_adj=0.630, P<0.001, N=17); garden warbler, y=0.108+0.037x (r²_adj=0.724, P=0.020, N=6); barn swallow, y=–0.538+0.084x (r²_adj=0.806, P<0.001, N=9), where x is total body mass (g) and y is lean dry breast muscle mass (g). The length of primary 8 had no significant effect on the relationships between breast muscle mass and total body mass.

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