To auditory researchers, echolocating mammals are the most intriguing of all vertebrate groups. Among the echolocators, bats are the most intensively studied species and the best understood with regard to hearing. As noted in chapter 1 of this volume, the study of bat hearing and bioacoustics represents "one of the triumphs of neuroethology." Hearing by Bats is the first modern book to address bat echolocation in a systematic and comprehensive manner. It provides detailed insights and masterful summaries of our current understanding of bat acoustics and hearing, while demonstrating that these animals provide invaluable model systems for the study of mammalian hearing in general.