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A fundamental question in biology is how diversity evolves and why some clades are more diverse than others.Phenotypic diversity has often been shown to result from morphological adaptation to different habitats.The role of behavioral interactions as a driver of broadscale phenotypic diversity has received comparatively less attention.Behavioral interactions,however,are a key agent of nat-ural selection.Antagonistic behavioral interactions with predators or with parasites can have sig-nificant fitness consequences,and hence act as strong evolutionary forces on the phenotype of species,ultimately generating diversity between species of both victims and exploiters.Avian obli-gate brood parasites lay their eggs in the nests of other species,their hosts,and this behavioral interaction between hosts and parasites is often considered one of the best examples of coevolu-tion in the natural world.In this review,we use the coevolution between brood parasites and their hosts to illustrate the potential of behavioral interactions to drive evolution of phenotypic diversity at different taxonomic scales.We provide a bridge between behavioral ecology and macroevolu-tion by describing how this interaction has increased avian phenotypic diversity not only in the brood parasitic clades but also in their hosts.