Colorado Birding Society
Recent bird sightings, photo gallery, trip reports, directions to birding spots throughout the state, checklists, report forms, and field trips.

Birds of Prey Foundation
Raptor rehabilitation organization based in Boulder County.

Colorado Field Ornithologists
On-line store, field trips, Colorado Bird Records Committee, checklists, rare bird alert, paper abstracts, journal articles, site guides with maps for 7 spots, report forms, photos and video clips, and bird counts.

Birding in Colorado
Basic guide to Denver metro area birding hot spots.

Rocky Mountain Bird Observatory
Conservation and education projects, volunteer opportunities, Partners In Flight database and bird conservation plan, and news. Formerly Colorado Bird Observatory.

Denver Field Ornithologists
Meetings and field trips.

National Wildlife Refuge Bird Checklists
Seasonal checklists for 16 sites in Colorado.

Colorado Bird-watching Sites
Guide to 13 sites from National Geographic.

Great Pikes Peak Birding Trail
Hiking trail connecting birding sites in five counties in the Pikes Peak area. Includes information and links for birding in the region.

Natural Diversity Information Source - Wildlife Species
Lists of birds, mammals, amphibians, and reptiles for each county.

Bird Pictures by Bill Schmoker
Gallery of high-quality digital photos, mostly from Colorado; tips on digiscoping techniques.