Acknowledgments

I am very grateful to Greg Budney, Curator, Laboratory of Natural Sounds, Cornell University, Ithaca, 159 Sapsucker Woods Road, Ithaca, NY 14850 for allowing me to use numerous recordings from the collection of the Laboratory of Natural Sounds. I am also indebted to Mrs. Andrea Priori, Carol Bloomgarden and Martha Fisher, of the Laboratory of Natural Sounds, who spent numerous hours of their valuable time to copy hundreds of vocalizations from the Library.

Thanks also to Paulo Boute, Edson Endrigo, Jeremy Minns and Luis Fabio Silveira, all from São Paulo, Brazil, and Juan Mazar Barnett, Argentina and Guy Kirwan, Great Britain, for making recorded vocalizations available for inclusion in this program and to Edson Endrigo and Dr. Karl Friedrich Müller, New York, for permission to use some of their excellent photographs.

For their accompaniment on my numerous field trips to the region thanks also to Mario Barroso Ramos Neto, São Paulo; Dr. Karl Friedrich Müller, New York; Dr. Edwin O. Willis, Departamento de Zoologia, Universidade Estadual de São Paulo, Rio Claro (SP); Luis Avelino Ribeiro, Fazenda Intervales; and Pedro Develey, São Paulo; I am also very grateful to Professors Dr. Tereza Kipnis and Dr. Dias da Silva for their generous hospitality which allowed me to stay at their houses in São Paulo and Ubatuba (SP), and to Acacio Senior and Gloria de Barros for their generous hospitality that made it possible to stay at their house in Petropolis (RJ).

Over the years I have received much help and suggestions from Dr. Raymond Paynter, Curator at the Museum of Comparative Zoology, Harvard University, Cambridge, MA. and I would also like to thank Dr. Paynter for allowing me access to the bird collection of the Museum of Comparative Zoology at Cambridge to study the skins and for the use of his extensive personal library on South American ornithology.

I would also offer additional thanks to Prof. Dr. Edwin O. Willis, Rio Claro who was an indispensable source of information concerning the birds of Estado São Paulo.

Finally thanks go to Dr. David Gibson of GG Software who designed and wrote the software used to display this work and provided much additional editing help and advice.