Figure 3.

Three-dimensional talon shape variation in Acciptriformes. (a) Scatterplot depicting the morphospace of six species of raptorial bird: Aeg. monachus, Aqu. audax, Hie. moorei, Hie. morphnoides, Hal. sphenurus and Vul. gryphus. Warped meshes refer to talon shape in the extremes of the axes and the meshes heatmaps are based on Euclidean distances: cooler colours (blue-green) indicate minor changes and warmer colours (orange-red) indicate major changes. (b) UPGMA performed on the entire shape based on all PC scores. Bird art by Scott Partridge. (Online version in colour.)