Figure 6 in Eigensurface analysis, ecology, and modelling of morphological adaptation in the falconiform humerus (Falconiformes: Aves)

Figure 6. Models of the first three eigensurface (E-Surf) axes that describe the distribution of morphology among the 50 humerus specimens. Eigensurface axis 1 describes 41.8% of observed shape variation and shows clear differences in the shapes of the deltoid and bicipital crests between high and low scoring specimens. Eigensurface axis 2 accounts for 12.8% of morphological variation and describes more subtle variation in the shape of the deltoid crest. Eigensurface axis 3 includes 7.78% of surface shape variation and exhibits differences in the shape and position of the deltoid and bicipital crests between specimens. See text for further discussion of the shape changes and interpretation of the morphological variation described by these model axes.