Fig. 1From: The multifactorial nature of beak and skull shape evolution in parrots and cockatoos (Psittaciformes)Phylomorphospaces of the original shape data. Points coloured by clade (a, b) and diet (c, d). PC1 vs PC2 (a, c) and PC2 vs PC3 (b, d). Inset skulls characterise the shapes represented by the maximum and minimum end warps of their corresponding PC axesBack to article page