John Kirn, chair and professor of neuroscience and behavior, professor of biology, director of Graduate Studies, is the co-author of a book chapter titled "Regulation and function of neuronal replacement in the avian song system." The chapter is published inside the book Neuroscience of Birdsong, released in 2009 by Cambridge University Press. The book provides a comprehensive summary of birdsong neurobiology, and identifies the common brain mechanisms underlying this achievement in both birds and humans. Written primarily for advanced graduates and researchers, there is an introductory overview covering song learning, the parallels between language and birdsong and the relationship between…