D. Kimbrough Oller is Professor and Plough Chair of Excellence in the School of Audiology and Speech-Language Pathology at the University of Memphis and an external faculty member of the Konrad Lorenz Institute for Evolution and Cognition Research, Altenberg, Austria. He is coeditor, with Ulrike Griebel, of Evolution of Communications Systems: A Comparative Approach (MIT Press, 2004).