Backyard Birding
Backyard Wildlife Habitat (National Wildlife Federation)
Project Feederwatch (Cornell Laboratory of Ornithology)
National Bird-Feeding Society
Nutty Birdwatcher

Birding Data and Projects
Bird Banding Laboratory - All about bird banding; report banded birds you've seen
BirdSource - Bird counts and count data, including CBC, GBBC, Project Feederwatch (Cornell / National Audubon)
Breeding Bird Atlas - Home Page
eBird - Contribute your records to science to benefit the birds!
Institute for Bird Populations - Bird research programs, internships, banding classes, and more
Migratory Bird Research - Patuxent Bird Population Studies
New York State Avian Records Committee (NYSARC)
North American Breeding Bird Survey
NYSOA Waterfowl Count
Project Feederwatch (Cornell Laboratory of Ornithology)
Project Puffin

Bird ID, Bird Photos, Art, and Bird Songs
Audubon's Birds of North America Online - Complete double elephant folio, courtesy of the U. of Pittsburgh
Avibirds -Online Guide to the Birds of Europe and Suriname, including sound & video
BIRD SONGS of some NYS birds (recordings by Tony Phillips)
Bird Families of the World - Great resource, family by family (rather than species by species)
Bird Identification InfoCenter by USGS - Comprehensive resource with descriptions, photos, sounds, maps.
Birds of Eastern North America by Nearctica - descriptions, photos, paintings, sounds, maps
Birds of the World on Postage Stamps organized by country with complete species index in taxonomic order
Birdzilla Wild Bird Omnibus - Online guide with descriptions, photos, range maps, and audio recordings
Cornell Lab of Ornithology Online Bird Guide
Cornell Lab's Macaulay Library Natural Sounds & Video Archive (search & enjoy 80,000 recordings for free)
Feather Atlas of North American Birds - Excellent photos of bird feathers from the USFWS forensics lab
Internet Bird Collection (world list with images and videos)
McGill Bird Observatory Photo Library - A reference guide for those interested in the finer points of bird ID
Nature of New England - Birds, Mammals, Butterflies, Wildflowers - photos, information, range maps, sounds
The Poultry Page - Domestic peafowl, pigeons, guineafowl, ducks,geese, etc. Look for odd ducks here!
Shorebirds (digiscoped) - Excellent comparative photos of shorebirds of varying maturities and plumages

Other Birder's Reference Resources
Avibase - Huge database on the world's birds, showing taxonomic names/relationships and common names in many languages (Bird Studies Canada)
BIOSIS Bird Links (now THOMSON SCIENTIFIC Biology Browser)
Bent Life Histories (Birdzilla.com) - Enter a species name in the Search box, click Search, and then click the Bent Life History button at the upper right after you get to the species detail page.
Birding on the Net (Siler--previously Birding on the Web)
Birds of North America Online - Comprehensive online resource (join NYSOA and pay $25 instead of $40)
eNature.com (recently acquired by National Wildlife Federation)
Electronic Resources on Ornithology
GLOSSARY:  Patuxent Bird Glossary 
Life of Birds (based on the PBS series by Sir David Attenborough)
Plumage & Molt Terminology (Ontario Field Ornithologists)
Ocean Wanderers (Pelagic Birding; NY Rarities) - Great website by Angus Wilson
Owl Pages - Information About Owls
O.W.L - Ornithological Web Library - Over 1200 non-commercial websites around the world
Scientific Bird Names Explained - brought to you by uk.rec.birdwatching
SORA - Searchable Ornithological Research Archive - U. of New Mexico's amazing online archive of complete articles (some dating back to the 19th century) from 8 scientific journals including Auk, Condor, and Wilson Bulletin

Ecology & Environment
Woody Ornamental Exotic Pests - woody ornamental exotic pests (Cornell)
Northeastern Forests - US Forest Service
Plant Pests Information Page - USDA
Invasive and Exotic Insects - Invasive.org
Insects & Pests that May Affect Connecticut's Trees - Connecticut Tree Protective Association
Forestry Images - includes images of pests, diseases, and invasive plants
Mile-a-Minute Weed:
Mile-a-Minute Species Profile - USDA
Mile-a-Minute Pest Alert -  USDA
Mile-a-Minute Fact Sheet - Massachusetts Introduced Pests Outreach Program

Non-bird Nature Reference Resources
Butterflies and Moths of North America - Big Sky Institute, U. of Montana - photos, range maps, and more
eNature.com online field guides - a variety of online field guides
Forest Mycology Team - USFS site, including photos of mushrooms/fungi
Nature of New England - Birds, Mammals, Butterflies, Wildflowers
Simply Fungi - Good general info & photos from NJ
Wildflowers of Eastern North America by Nearctica - descriptions, photos, maps

Webcams (live images online)
Bald Eagle Nest - National Wildlife Federation
Bald Eagle Nest at Blackwater Refuge (Maryland)
Eastern Screech-Owl, Austin, Texas
Osprey Nest in Brookhaven, NY (Long Island)  (Dennis Puleston Osprey Fund) - 2003 highlights & info
Osprey Nest at Blackwater Refuge (Maryland) - Eagles perch there in winter
Peregrine Falcon Nest on Dunn Memorial Bridge (Albany/Rensselaer) (NYSDEC)
Rochester FalconCam - now run by Genesee Valley Audubon Society in association with Kodak
Peregrine Falcon Nest at 55 Water Street, NYC

Education & Games
Patuxent Bird Quiz, a fun way to sharpen your skills
Mission: Migration, an online game in which you guide your flock through the hazards of migration
Home Study Course in Bird Biology, second edition (Cornell Laboratory of Ornithology)
Kidwings, a fun educational bird site for kids of all ages

Traveling Birder's Reference
INTERNATIONAL
Birds of the World on Postage Stamps organized by country with complete species index in taxonomic order
Birding Pal International
Birding Hotspots Around the World
Birding in Spain (NE Spain and Mallorca) 11/17/08
Comfortable Birding For All - Wheelchair birding, birding from vehicles, and easy trails
Local / Regional Birding Websites (American Birding Association)
MAINE
Maine:  Stanton Bird Club (Lewiston)
NEW JERSEY
NJ Birding & Wildlife Trails  - online version of the new NJAS guide to Delaware Bayshore trails
NEW YORK STATE
Adirondack Birding  (Adirondacks)
Alan Devoe Bird Club  (Columbia County)
Rockland Audubon Society  (Rockland County)
Sullivan County Audubon Society   (Sullivan County)
Where to Go Bird Watching in Westchester (Hudson River Audubon - Westchester County)
New York:  Links to Other Bird Clubs Around the State (NYSOA) (Statewide list)

Tools of the Trade
Checklists & Hotlines
AOU Checklist
Checklist of the Birds of NYS (NYSOA)
Bird Checklists of the United States (USGS, some of these are outdated)
Checklists (AviSys, some are outside of North America)
Rare Bird Alerts (Virtual Birder)
Bird Sighting Mailing List Transcripts & Archives
MidHudsonBirds - Mailing list covering the local region.  Sign up to get all the notes and submit your own
NYSBIRDS
BIRDEAST
BIRDCNTR
BIRDWEST
Hudson River Almanac - an enjoyable weekly update on seasonal area observations.
Checklists & Hotlines
Winging It archives - American Birding Association newsletter, including Sightings, the rarity column
Bird Songs & Sounds
Bird Song Mnemonics - Phrases to help you remember songs
Field Guides & Reference Books
Sibley Guides - Updates to Sibley's Guides to Birds and Bird Life & Behavior; Art Gallery
Optics & Photography
Better View Desired (commercial)
Desperately Seeking Binos - Guide to selecting binoculars, 1999 (Cornell Lab of Ornithology)
Digibird.com - Digiscoping resource (George Raiche)
Digiscoping (Laurence Poh, "the father of digiscoping")
Digital Photography, Digiscoping, and The Digital Darkroom (Stéphane Moniotte)
Eagle Optics (commercial)
Mirakel Optical (commercial, Coxsackie, NY)
New Jersey Audubon Pick of the Pack - recommended binoculars & scopes
Optics for Birding Buying guide (commercial)
Listing Software (commercial sites)
AviSys Birding Software
Thayer Birding Software

Commercial Sites
About.com
Better View Desired (Optics)
Birder.com
Birder's World (magazine)
Birding.com (by Peter Thayer of Thayer Software)
Birding in New York (Virtual Birder)
Birdwatching.com
Birds as Art (Arthur Morris Photography)
Birdzilla.com - A comprehensive site including full text of the entire Bent Life Histories
Jeff Nadler Photography (birds and other wildlife of New England & Northern NY)
Virtual Birder
WildBirds.com

Inclusion of links on this page does not imply endorsement or validation on the part of the Ralph T. Waterman Bird Club. Selection of sites for inclusion in this list is solely at the discretion of the Ralph T. Waterman Bird Club.