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Residual (log) BMR (ml O2 h−1) of zebra finches as a function of age (years). (a) Females, (b) males and (c) both sexes. (a,b) Lines connect subsequent measurements of individuals. (c) Males, filled symbols and solid line; females, open symbols and dashed line. Residuals were extracted from mixed linear models including (log) body mass and sex in (a,b), and only (log) body mass in (c).
