Comparison of relative proportions of hindlimb segments in terms of mass and length for a subsample of 15 neognath birds. Numerical values in colored boxes are the coefficients of variation for each segment. In bar plots, the data is stacked and non-overlapping so that sum values add to 100%. Data for segment lengths come from Stoessel et al.. Note that digit length only refers to that of digit III. Colors of boxes and bars correspond to segments as labeled in Figure 3. Significant differences in coefficients of variation within one set of traits (mass or length) were determined using the methodology of Sokal & Braumann (see text for Results).