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THE WILSON JOURNAL OF ORNITHOLOGY • Vol. 124. No. 1. March 2012 
ACKNOWLEDGMENTS 
I thank Luiz Pedreiru Gonzaga who prepared the 
sonogram, and K. L. Schuchmann, Johan Ingels, and an 
anonymous reviewer for critical comments on the manu¬ 
script. The author was supported by a research grant from 
the Brazilian Research Council (CNPq # 303559/2008-0). 
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