Fig. 4

Violin plots of bird body mass, by diet. Masses of carnivores (A, B) and herbivores (C, D) are grouped by trends apparent in Fig. 3C, D, excluding (A, C) and including (B, D) semi-specialists. Carnivores are split into invertivores and vertivores, herbivores are split into folivores + frugivores (FolFrug) and granivores + nectarivores (GranNect). Cut-off points, calculated using the Youden index (see “Methods”), are labelled with a line. Diets with the same letters above them do not have significantly different average masses in phylogenetic HSD at the p = 0.05 level (Table 2)