Animals can respond to ecological challenges by behaving in different ways. If conditions persist in time, the correlated evolution of physiological, morphological, and life history traits associated with these behaviors can accelerate reproductive isolation and result in rapid speciation. However, behavioral traits tend to be evolutionarily labile, especially if they are under strong environmental control. Thus, initial divergence might not persist to influence macroevolutionary dynamics. The research I will present aims to understand the role of behavior in diversification by studying the following processes: (1) the development of reproductive isolation in the early stages following behavioral switches, and (2) the macroecological mechanisms associated with the evolution of alternative behavioral strategies.