Jack W. Bradbury is the Robert G. Engel Professor Ornithology Emeritus. Dr. Bradbury’s research efforts have included field studies on mating system evolution and social dispersion in tropical bats, the evolution of leks in African fruit bats and grouse, foraging dispersions of African antelopes, sexual selection in hermaphroditic sea slugs, and most recently, the functions of vocal mimicry in wild parrots. Dr. Bradbury retired in July 2009, and is no longer supervising students.