Chicago Wilderness Habitat Project
- Information about training and monitoring activities, including plant surveys, frog monitoring, and important bird areas.
- http://www.habitatproject.org/

Chicago Geology
- Includes a transcript of a 1902 report on the area's geology, plus outlines and photos of field trips to points of geologic interest in and around the city.
- http://ebeltz.net/niftylinks/chgolinks.html

vPlants - A Virtual Herbarium of the Chicago Region
- Searchable and browsable catalog of the herbarium collections of the Morton Arboretum, Field Museum, and Chicago Botanic Garden, including photos of many of the plant specimens.
- http://www.vplants.org/

A Naturalist's Tour of Southern Lake Michigan
- Naturalist Joel Greenberg shares his eight favorite natural areas in the Chicagoland region.
- http://www.press.uchicago.edu/Misc/Chicago/306488.html

Partners for Clean Air
- Grass-roots coalition of regional government, business and community organizations. Features advocacy, legislation issues, a smog alert email newsletter, a Midwest HazeCam, air quality index, reports and forecasts and ozone data.
- http://www.cleantheair.org/

Chicago Wilderness Magazine
- Quarterly magazine that offers news, articles, and features centered around the region's natural wonders. Includes secure subscription form, news of the wild, current issue, back issues' archive, and message board.
- http://chicagowildernessmag.org/

Chicago Wilderness
- Alliance of more than 140 public and private organizations working together to protect, restore, study and manage the precious natural ecosystems of the region for the benefit of the public. Mailing list, articles, and biodiversity resources are featured.
- http://www.chiwild.org/