bookmark bayou Permits to study adaptive evolution using multi-optima Ornstein-Uhlenbeck (OU) models. bayou incorporates different methods into a flexible software package for the R statistical environment. It also provides a reversible-jump algorithm that jointly estimates the location, number, and magnitude of shifts in adaptive optima from phylogenetic comparative data. These scripts can be used to compare specific hypotheses. Furthermore, informative priors can be incorporated from different data sources to test mechanistic interpretations of phylogenetic patterns of trait divergence.