5. ACKNOWLEDGEMENTS
This study was funded by a Franzen Fellowship grant from the Amazon Conservation Association. We thank the staff and promotores at Los Amigos Biological Station and Los Amigos Conservation Concession, respectively, for helping to ensure the success of our field work. RBR would especially like to thank promotore Don Hernan, for his sense of humor despite numerous language barriers and difficult working conditions. Special thanks goes to Bioacoustics at the Cornell Lab of Ornithology for their wonderful technical support and assistance with acquiring recording equipment, and to Robert Guralnick, for allowing us to use his personal SD cards. We are further indebted to Larry Chen, Andrew Dreelin, and Izkak Shafran for their editorial assistance with the manuscript, and to Adrian Forsyth, without whose support this work would not have been possible.