Year: 1997Publication Type: Journal Article - Multi-AuthorJournal Volume: 111Page Range: 226-241Article/Chapter Title: Vocal development in budgerigars (Melopsittacus undulatus.): Contact callsJournal Name: Journal of Comparative PsychologyAuthor(s) from ICR Staff: Susan Farabaugh, Ph.D.Author Name/Init: Author Surname: Brittan-PowellAuthor Initials: E.F. Author Surname: DoolingAuthor Initials: R.J. Author Surname: FarabaughAuthor Initials: S.M.