Foreword, by K. Z. Lorenz.
Tonal quality of bird sounds, by P. Marler.
Experimental studies in the ontogeny of avian vocalizations, by M. Konishi and F. Nottebohm.
Song as a reinforcer, by J. G. Stevenson.
Song development in the zebra finch and other Estrildid finches, by K. Immelmann.
The control of avian vocalization by the central nervous system, by J. L. Brown
The effects of testosterone on avian vocalizations, by R. J. Andrew.
Roles of budgerigar vocalization in the integration of breeding behaviour, by B. F. Brockway.
Communication in canary courtship calls, by J. A. Mulligan and K. C. Olsen.
Duetting, by T. Hooker and B. I. Hooker (Lade).
Functions of territorial song in the white-throated sparrow, by J. B. Falls.
Embryonic communication, respiration and the synchronization of hatching, by M. A. Vince.
Functional and ecological aspects of vocalization in weaverbirds, by J. H. Crook.
Vocal characters and avian systematics, by W. E. Lanyon.
Geographic variation in bird vocalizations, by G. Thielcke.
Aspects of the evolution of man's appreciation of bird song, by E. A. Armstrong.
The aesthetic content of bird song, by J. Hall-Craggs.
