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THE WILSON JOURNAL OF ORNITHOLOGY • Vol. 124. No. September 2012 
understand song development and function in this 
and other species of thrushes. 
ACKNOWLEDGMENTS 
Wc thank W. A. Searcy. Karla Rivera-Caceres, and two 
anonymous reviewers for providing helptul comments on 
an early draft of the manuscript. We also thank Vice- 
rrectoria tie Admmistracion of the Universidad de Costa 
Rica, especially Oficina de Seguridad y Transito for helping 
us with logistics and permits to conduct the study. MICIT/ 
CONICIT provided financial support of activities related to 
this investigation. Dean Hawthorne helped with Raven's 
detector and correlator. All procedures in the present study 
comply with the current laws of Costa Rica. 
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