Geographic variation in social behavior and in adaptations to competition among Andean birds /

Birds of Mexico and Central America /
by: Perlo, Ber van
Published: (2006)

Birds of Chile /
by: Jaramillo, Alvaro, 1967-
Published: (2003)

The birds of Ecuador /
by: Ridgely, Robert S., 1946-
Published: (2001)

Birds of Argentina and Uruguay : a field guide /
by: Narosky, Tito, 1932-
Published: (1989)

Adaptive modifications for tree-trunk foraging in birds.
by: Richardson, Frank, 1913-
Published: (1942)

Physiological adaptations for breeding in birds /
by: Williams, Tony D.
Published: (2012)

Birding in Venezuela /
by: Goodwin, Mary Lou
Published: (1994)

The birds of Colombia, and adjacent areas of South and Central America /
by: Meyer de Schauensee, Rodolphe, 1901-1984
Published: (1964)

Afterthoughts to Birding in Venezuela /
by: Goodwin, Mary Lou
Published: (1993)

Manual of neotropical birds /
by: Blake, Emmet Reid, 1908-1997
Published: (1977)

The birds of Ecuador and the Galapagos Archipelago : a checklist of all the birds known in Ecuador and the Galapagos Archipelago and a guide to help locate and see them /
by: Butler, Thomas Y.
Published: (1979)

Birds in Brazil : a natural history /
by: Sick, Helmut, 1910-1991
Published: (1993)

A photographic guide to birds of Ecuador and Galapagos /
by: Byers, Clive
Published: (2009)

A photographic guide to birds of southern Brazil : including the Pantanal and Atlantic Forest /
by: Byers, Clive
Published: (2008)

Bird behavior /
by: Sparks, John
Published: (1970)

Birds of Venezuela /
by: Hilty, Steven L.
Published: (2003)

Birds of Surinam /
by: Haverschmidt, François
Published: (1968)

The birds of Brazil /
Published: (1993)

Images of birds /
Published: (2005)

Where to watch birds in Peru /
by: Valqui, Thomas
Published: (2004)

A parrot without a name : the search for the last unknown birds on earth /
by: Stap, Don
Published: (1991)

A parrot without a name : the search for the last unknown birds on earth /
by: Stap, Don
Published: (1990)

Birds of La Plata /
by: Hudson, W. H. (William Henry), 1841-1922
Published: (1968)

Birds of La Plata /
by: Hudson, W. H. (William Henry), 1841-1922
Published: (1952)

Birds of La Plata /
by: Hudson, W. H. (William Henry), 1841-1922
Published: (1920)

An annotated checklist of Peruvian birds /
by: Parker, Theodore A.
Published: (1982)

A guide to the birds of Venezuela /
by: Meyer de Schauensee, Rodolphe, 1901-1984
Published: (1978)

Observations on birds of southeastern Brazil.
by: Mitchell, Margaret Knox Howell, 1901-
Published: (1957)

A checklist of Peruvian birds /
by: Parker, Theodore A.
Published: (1978)

Birds of South America : non-passerines : rheas to woodpeckers /
by: Rodríguez Mata, Jorge
Published: (2006)

The unfeathered bird /
by: Van Grouw, Katrina, 1965-
Published: (2013)

The birds of British Guiana : based on the collection of Frederick Vavasour McConnell ... /
by: Chubb, Charles
Published: (1916)

Birds of Peru /
Published: (2010)

Birds of Peru /
Published: (2007)

Oceanic birds of South America : a study of species of the related coasts and seas, including the American quadrant of Antarctica, based upon the Brewster-Sanford collection in the American Museum of Natural History /
by: Murphy, Robert Cushman, 1887-1973
Published: (1936)

Oceanic birds of South America : a study of species of the related coasts and seas, including the American quadrant of Antarctica, based upon the Brewster-Sanford collection in the American Museum of Natural History /
by: Murphy, Robert Cushman, 1887-1973
Published: (1936)