Fig. 6

Best-fitting models of trait evolution for humeral, radial, and ulnar cross-sectional traits. For each model, the total number of increments best fit by the model are presented as black bars. In the case of the Ornstein-Uhlenbeck models, OU3 and OU4, the superimposed red bars indicate the number of OU models that also had a significant value of α, representing the strength of selection