Aves do Brasil e da América do Sul

Xeno-canto - Bird songs from tropical America
Wikiaves - A enciclopédia das aves do Brasil
Arthur Grosset's Birds - Photos and notes about South American Birds
Centro de Estudos Ornitológicos
Birding Peru - All about birding in Peru
Bird's Photos - Carlos Henrique and Viviane with excellent bird pictures from southern Brazil
Bonito Birdwatching - Blog de Tietta Pivatto, Mato Grosso do Sul
Fotografia de vida selvagem - Aves do Amapá e do Ceará, de José Augusto
JQuental - Maravilhosas fotos das aves do Brasil
Birds of Pampas Plain - Argentina bird guide covering nearly 700 species

Birding Tours

Andean birding - Birding in the Andes, Amazon and Galapagos, in Ecuador
Rick Simpson - Bird guide Rick Simpson - Ubatuba - Southeast Brazil
Boute Expeditions - Birding in the entire Brazilian Northeast
Kolibri Expeditions - Bird watching tours in Peru and South America

Organizações

South American Classification Committee of AOU
The American Ornithologist' Union (AOU)
Neotropical Bird Club
The Cracid Specialist Group - About conservation of Guans and related birds
ANOR - Articulação Nordestina de Ornitologia

Aves da América do Norte, da Europa etc.

Birdpix - Excellent dutch photo site

Informação geral e literatura

BirdGuides - "better birding through technology"
Buteobooks - Good U.S. bookshop, specializing in Ornithology
Fatbirder - Birding web portal, with thousands of links

Recursos científicos

Searchable Ornithological Research Archive SORA
BIOONE - Aggregation of many bioscience journals (free abstracts)
Zoonomen.net - Scientific bird names