Fig. 5
From: The relationship between sternum variation and mode of locomotion in birds
Morphospaces showing A PC1 and PC2 axes and B PC3 and PC4 axes plotted against each other, with sternum shape warps associated with the extremes of each principal component indicated along each axis in ventral view (left) and lateral view (right). Individual point color and symbol indicate the predominant simplified locomotory mode of each species (legend provided). Major taxonomic groups that separate out at the periphery of the morphospace are shown in gray polygons. A PC1 and PC2 axes shown. B PC3 and PC4 axes shown. Phylogeny is overlain on top of the data points