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The relationship between basal metabolic rate (BMR) and body mass (Mb) in passerine birds (upper solid line), non-passerine birds (lower solid line) and across both clades (dashed line). The lines are generalized least-squares regressions controlling for phylogeny (see table 1). The inclusion of non-passerine species with Mb greater than the range of passerine Mb affects the overall slope.
