Fig. 2
From: Why are some species older than others? A large-scale study of vertebrates
a Distribution of p-values for the different explanatory factors retained in our final model with the age of species as response variable, for 100 trees sampled from the posterior distribution of trees obtained from MrBayes (best tree: blue dot); Relationships between the age of species and (b) the presence or absence of intraspecific colour polymorphism and (c) the interaction between the mean latitudinal distribution of species and their reproduction mode (viviparous versus oviparous)