Figure 2 Migratory strategy and latitudinal range are the best predictors of body size. (a) Heatmap showing adjusted R2 values for PGLS analyses of body size measures against the predictors. Positive correlations coefficients were recovered for each test. Numbers within each tile show the adjusted R2 values and are coloured in green when significant after adjusting p-values by FDR correction for multiple testing (FDR: *** < 0.001 > ** < 0.01 > * < 0.05). (b) Phenogram of mean body mass constructed in Phytools (Revell, 2012) showing abrupt differences in mean body mass between sister clades. Edge colours indicate the three genera: Calonectris (purple),Ardenna (green) and Puffinus (orange). Heatmaps next to the phenogram show the migratory strategy and the latitudinal range for each species.