Welcome to the Clayton-Bush lab! We study host-parasite coadaptation and diversification. Our work focuses on birds, their external parasites, and the symbiotic bacteria in those parasites. We integrate systematics, ecology, population genetics, experimental evolution, genomics, functional morphology, animal behavior, and conservation biology. Our work employs captive birds in the lab, as well as fieldwork at home and abroad, most recently in the Galápagos and southern Bahamas.