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Articles

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Offspring Sex and Duration of Post-fledging Parental Care in the Sexually Size Dimorphic Nazca Booby (sula Granti)
Terri J. Maness, Mark A. Westbrock, Kenneth J. Feeley, and David J. Anderson

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Mixed-species Flock Composition in a Northwestern Ecuadorian Cloud Forest
Esteban A. Guevara, Juan C. Valarezo, Alexandra Onofa, and Fabián Cupuerán

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Bird Assemblages in Two Types of Forests in the Floodplain of the Lower Paraná River (argentina)
Ana L. Ronchi-Virgolini, John G. Blake, Rodrigo E. Lorenzón, and Adolfo H. Beltzer

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Vocalization Activity at Leks of Six Manakin (pipridae) Species in Eastern Ecuador
Renata Durães, John G. Blake, Bette A. Loiselle, Thomas B. Ryder, Wendy P. Tori, and José R. Hidalgo

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News—noticias—notícias
Ornitología Neotropical

Short Communications

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Nest Predation by Arboreal Snakes on Cavitynesting Birds in Dry Chaco Woodlands
Igor Berkunsky, Federico P. Kacoliris, Sarah I. Faegre, Román A. Ruggera, Joaquín Carrera, and Rosana M. Aramburú

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Notas Sobre La Dieta Del Búho Ventribandeado (Pulsatrix Melanota) En Ecuador
Héctor Cadena-Ortiz, Daniela Bahamonde-Vinueza, and Elisa Bonaccorso

Short Communications

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Nest Predation by Arboreal Snakes on Cavitynesting Birds in Dry Chaco Woodlands
Igor Berkunsky, Federico P. Kacoliris, Sarah I. Faegre, Román A. Ruggera, Joaquín Carrera, and Rosana M. Aramburú

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Notas Sobre La Dieta Del Búho Ventribandeado (Pulsatrix Melanota) En Ecuador
Héctor Cadena-Ortiz, Daniela Bahamonde-Vinueza, and Elisa Bonaccorso