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- Is the population of Floreana Mockingbird Mimus trifasciatus declining?
Gustavo Jiménez-Uzcátegui, Washington Llerena, W. Bryan Milstead, Edison E. Lomas and David A. Wiedenfeld
Cotinga 33 online (2011): 1–7
- The birds of Reserva Ecológica Guapiaçu (REGUA), Rio de Janeiro, Brazil
Leonardo Pimentel and Fábio Olmos
Cotinga 33 online (2011): 8–24
- First notes on the courtship behaviour of Black-throated Tody-Tyrant Hemitriccus granadensis in Colombia and Ecuador
Esteban Botero-Delgadillo and Niels Krabbe
Cotinga 33 online (2011): 25–26
- Recent conservation efforts and identification of the Critically Endangered Mangrove Finch Camarhynchus heliobates in Galápagos
Birgit Fessl, Michael Dvorak, F. Hernan Vargas and H. Glyn Young
Cotinga 33 online (2011): 27–33
- Foothill avifauna of the upper Urubamba Valley, dpto. Cusco, Peru
Mark B. Robbins, David Geale, Barry Walker, Tristan J. Davis, Mariela Combe, Muir D. Eaton and Kyle P. Kennedy
Cotinga 33 online (2011): 34–45
- Vocalisations and juvenile plumage of Azure-rumped Tanager Tangara cabanisi
Knut Eisermann, Gerardo López, Jason Berry, Josué de León Lux and Andy Burge
Cotinga 33 online (2011): 46–49
- Two new species for Nicaragua and other notes on the avifauna of the Atlantic Region and Paso del Istmo Biological Corridor
Luis Sandoval and Wayne J. Arendt
Cotinga 33 online (2011): 50–57
- La Golondrina Tijerita Hirundo rustica sigue expandiendo su área de nidificación en Argentina
Fabricio Miguel Idoeta, Miguel Angel Roda y Ignacio Roesler
Cotinga 33 online (2011): 58–60
- Primer registro de la Golondrina de las Cavernas Petrochelidon fulva para Venezuela y Sur América
Fidel Escola, Rosanna Calchi, Cheyla Hernández y Clark Casler
Cotinga 33 online (2011): 61–62
- Notes on breeding by Yellow-crowned Night Heron Nyctanassa violacea in southern Brazil
Dimas Gianuca, Joaquim O. Branco and Carolus M. Vooren
Cotinga 33 online (2011): 63–72
- First record of Brown Noddy Anous stolidus for the South American Pacific coast
Carlos Camacho and Santiago Torres
Cotinga 33 online (2011): 73–75
- Nuevos registros de Columbina minuta, Pionus senilis y Basileuterus culicivorus en el estado de Yucatán, México
Juan Chablé-Santos, Celia Sélem-Salas y Silvia Hernández-Betancourt
Cotinga 33 online (2011): 76–77
- La Tangara Aliamarilla Thraupis abbas en Costa Rica, historia y dos nuevos registros
Andrés Zuñiga y Luis Sandoval
Cotinga 33 online (2011): 78–79
- Deadly intra-specific aggression in Collared Aracari Pteroglossus torquatus
Jeffrey D. Ritterson and Adam C. Stein
Cotinga 33 online (2011): 80
- First record of Blue Grosbeak Passerina caerulea in western Ecuador
Dušan M. Brinkhuizen, Daniel López Velasco, Joan Ferrer Obiol, Guillermo Rodríguez, José Ardaiz Ganuza and Luke Seitz
Cotinga 33 online (2011): 81
- The nest and eggs of Blue-and-black Tanager Tangara vassorii
Harold F. Greeney, Jose Simbaña and Rudy A. Gelis
Cotinga 33 online (2011): 82
- The nest and eggs of Yellow-throated Bush Tanager Chlorospingus flavigularis
Harold F. Greeney, Bryan Suson, Rudy A. Gelis, Ben Freeman and Eliot T. Miller
Cotinga 33 online (2011): 83–84
- First photographs of Black Tinamou Tinamus osgoodi in Ecuador with notes on subspecific identity and occurrence
Dušan M. Brinkhuizen and María Lorena Córdova Saeteros
Cotinga 33 online (2011): 85–86
- Primer registro de hibridación entre la variación melánica y no melánica de la subespecie Pyrocephalus rubinus obscurus
Eveling Tavera Fernández
Cotinga 33 online (2011): 87–88
- Tiny Hawk Accipiter superciliosus attacking a Golden-green Woodpecker Piculus chrysochloros in central Amazonian Brazil
Thiago Vernaschi Vieira da Costa and Claudeir Ferreira Vargas
Cotinga 33 online (2011): 89–90
- Primeiro registro do criticamente ameaçado pica-pau-do-parnaíba Celeus obrieni no Estado do Mato Grosso (Brasil) e comentários sobre distribuição geográfica e conservação
Túlio Dornas, Gabriel Augusto Leite, Renato Torres Pinheiro e Marco Aurélio Crozariol
Cotinga 33 online (2011): 91–93
- First records of Blue-billed Black Tyrant Knipolegus cyanirostris for Goiás, Brazil
Iubatã Paula de Faria, Sandro Barata Berg, Tarcísio Lyra dos Santos Abreu, Ana Paula Diniz Nakamura and Pedro Diniz
Cotinga 33 online (2011): 94–95
- New specimens extend the range of Serra Antwren Formicivora serrana
Henrique Batalha Filho, Fábio Raposo do Amaral and Daniel Honorato Firme
Cotinga 33 online (2011): 96–97
- First documented record of Veery Catharus fuscescens in southern Brazil
Nicholas Kaminski
Cotinga 33 online (2011): 98
- El Mirasol Grande Botaurus pinnatus en el sur de la provincia de Buenos Aires
H. Daniel Mac-Lean y Cintia Eleonora Celsi
Cotinga 33 online (2011): 99–100
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