Fig. 8. Do nectarivorous birds have different diurnal glomerular filtration rates (GFRs) compared with equal-sized birds with other dietary habits? (A) Phylogeny of avian species with GFR data (Table 1). (B) The relationship between body mass (M_b; g) and GFR (ml h^–1) was described by a power function with an exponent equal to 0.74±0.26 (N=28). (C) The phylogenetically independent contrasts between log₁₀(M_b) and log₁₀(GFR) for nectarivorous birds (filled circles) are within the 95% confidence interval (represented by the broken lines) of the regression line relating the standardized contrasts of log₁₀(M_b) and log₁₀(GFR) for species with other dietary habits. The exponent of this phylogenetically corrected relationship equals 0.72±0.10 (N=23).