Illinois Birds - Species list, distribution map and detailed information on a large number of bird species found in Illinois. - http://www.inhs.uiuc.edu/chf/pub/ifwis/birds/
Bird Checklists - Checklists for the state and 9 refuges in Illinois. - http://www.npwrc.usgs.gov/resource/birds/chekbird/r3/17.htm
Chicago Area Birds and Wildlife - Searchable database of photos of local birds and wildlife, plus a birding forum. - http://www.chicagobirds.com/
Carlyle Lake Bird Report - Photos, bird checklist, site guide, and recent sightings. - http://bh2.htc.net/~kdan/report.htm
Illinois Ornithological Society - Information on field trips for birders, bird alerts, and the Illinois Ornithological Records Committee. - http://www.illinoisbirds.org/
Birding Fest of Southernmost Illinois - Annual event held in late April-early May at the Cache River State Natural Area. - http://www.birdingblitz.org/
Evanston North Shore Bird Club - Located in north suburban Chicago. Field trips, meetings, and photos. - http://www.ensbc.org/
Illinois and Chicago Net-Birding - Urs Geiser's comprehensive birding site, with checklists, rare bird alerts, and resources. - http://home.xnet.com/~ugeiser/Birds/
Speaking of Birds - Jim Frazier's site with articles, resources, images, and speeches on birds and birding. - http://www.speakingofbirds.com/
The Gadwall Birding Page - Chicago area birding guide, photographs, and trip reports. - http://www.gadwall.com/birding/
Birding Breaks: Illinois Grassland Species and Research - Virtual tour in search of grassland species; tag along with researchers as they investigate breeding success. - http://www.virtualbirder.com/vbirder/onLoc/onLocDirs/BB_ILSUM_01/
Illinois Raptor Center - Rehabilitation center near Decatur. - http://www.illinoisraptorcenter.org/
DuPage Birding Club - Meetings, field trips, hotline, count results, and county bird checklist. - http://home.xnet.com/~ugeiser/Birds/BirdClub.html
Chicago Ornithological Society - Meetings and programs, field trips, educational activities, and IBET (Illinois Birders Exchanging Thoughts) e-mail group. - http://www.chicagobirder.org/
Birding in Illinois - Bird checklist, maps, rare bird alerts, information about tours and guides, and links to birdwatching sites in Illinois. - http://www.camacdonald.com/birding/usillinois.htm
The Birds of Fermilab - Pages containing the results of current survey of the birdlife found on the site of the Fermi National Accelerator Laboratory Chicago, Illinois. - http://www.fnal.gov/ecology/wildlife/list.html