Mango Verde  
   Photos and sounds for almost 2000 bird species; field guide quick indices.
   http://www.mangoverde.com/

Western Palearctic Bird Sounds  
   Links to sound recordings on other sites.
   http://www.ifrance.com/WPBS/

Eggs - A Virtual Exhibition  
   The Provincial Museum of Alberta's on-line, searchable, field guide of over 300 bird eggs. Global, with emphasis on birds of Alberta. Includes photos and taxonomic information.
   http://www.pma.edmonton.ab.ca/vexhibit/eggs/vexhome/egghome.htm

Multilingual Bird Search  
   Translates world bird names between several languages, including scientific names. Includes photo gallery.
   http://www.knutas.com/birdsearch/

Introduction to the Aves  
   Scientific background and information on birds.
   http://www.ucmp.berkeley.edu/diapsids/birds/birdintro.html

Birds of the World  
   Lists of all species with scientific and English names, subdivided by Family. Choice of list based on the Clements or the Sibley and Monroe classification schemes.
   http://birdingonthe.net/clements/

Bird Lists  
   Lists sorted by taxonomy, scientific names, or English names for the world, the ABA area, or the AOU area.
   http://birdingonthe.net/birdlists/

Exotic Pet Veterinarian - Avian Anatomy  
   Describes the anatomy and physiology of birds for the lay audience, explaining technical terms along the way. Some emphasis on details of psittacines.
   http://www.exoticpetvet.net/avian/anatomy.html

Birds of North American, Audubon's Watercolors  
   Fifty-one images of North American birds from watercolors done by John James Audubon. List can be browsed by common or scientific name.
   http://www.nature.net/birds/

Virtual Bird  
   A collection of bird photographs, videos, and songs from North America and Europe (mainly Finland).
   http://www.virtual-bird.com/

Bird Families of the World  
   Short descriptions and sounds of the world's bird families by Chris Butler.
   http://www.eeb.cornell.edu/winkler/botw/Main.html

The Internet Bird Collection  
   Video library of footage of the world's birds, sponsored by the Handbook of the Birds of the World.
   http://www.hbw.com/ibc/

Birds of North America  
   Comprehensive reference series on North American birds, with information and sample profiles.
   http://birds.cornell.edu/birdsofna/

Avibase  
   An extensive database information system about all birds of the world, containing nearly 1 million records about 10,000 species and 22,000 subspecies of birds, including distribution information, taxonomy, and synonyms in several languages.
   http://www.bsc-eoc.org/avibase/avibase.jsp

Handbook of the Birds of the World  
   Information about the book series that will illustrate and deal in detail with all the species of birds in the world. Site includes tables of contents, sample pages, and publication schedule.
   http://www.hbw.com/

A Field Guide to the Birds on the Web  
   Links to pictures, sounds, and video of the birds of the world, systematically indexed.
   http://fieldguide.tripod.com/

Birdhybrids  
   Mailing list for discussion of bird hybrids.
   http://fr.groups.yahoo.com/group/birdhybrids/

Bird Hybrids Database  
   Worldwide database compiled from the ornithological literature of birds with two different species as parents. Includes complete references for each species combination. In English, French, and Spanish.
   http://www.bird-hybrids.com/

History of North American Bird Names  
   Details all the changes in the American Ornithologists' Union Checklists from 1886 - 2000.
   http://members.aol.com/darwinpage/zoo/AOUmenu.htm

Class Aves  
   Provides a definition of birds (Aves) and describes their traits.
   http://animaldiversity.ummz.umich.edu/site/accounts/information/Aves.html

John Penhallurick's Bird Data Project  
   Attempt to build a comprehensive database about the birds of the world, both extant and extinct since 1600.
   http://worldbirdinfo.net/

Birds: Wonders of the Sky  
   World Book Encyclopedia article covers physical features, behavior, migration, factors which determine range, and how to protect birds. Includes brief facts on individual species.
   http://www.worldbook.com/features/birds/html/

American Ornithologists' Union Check-list of North American Birds, Seventh Edition  
   Official source on the taxonomy of birds found in North and Middle America, including adjacent islands. The full list of bird species (with scientific and English names) is online in HTML, .pdf, and Excel formats.
   http://www.aou.org/checklist/