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Summary: SHORT COMMUNICATIONS 137
gratefully acknowledge the Ministerio de Agricultura, Direction General Forestal y Fauna
of Peru for the opportunity to work in the Manu National Park.
LITERATURE CITED
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on Barro Colorado Island. Bull. Am. Mus. Nat. Hist. 58: 123-166.
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mating systems. Science 197:215-223.
KOEFCKE, M. 1972. Uber die Resistenzformen der Vogelnester in einem begrenzten Gebeit
des tropischen Regenwaldes in Peru. J. Omithol. 113: 138-160.
LOWTHER,P. E. 1975. Geographic and ecological variation in the family Icteridae. Wilson
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ROB~SON, S. K. 1985a. Coloniality in the Yellow-rumped Cacique as a defense against
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-. 1985~. The Yellow-rumped Cacique and its associated nest pirates. Pp. 898-907
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