FIGURE 3.

Evolutionary interdependence between the eggshell C number and (a) nest attachment, (b) nest site or (c) nest structure. For each nest character, the transition rates (q_ij) between four different combinations of the C number and nest character categories were estimated by the dependent model in BayesTraits with the assumption that the two characters evolved interdependently. The thickness of the arrows is proportional to the estimated transition rates. The estimated probabilities of different character combinations are also shown for the root of the phylogenetic tree (p_i)