National Wildlife Refuge Bird Checklists
- Seasonal checklists for 16 sites in Colorado.
- http://www.npwrc.usgs.gov/resource/birds/chekbird/r6/8.htm

Eckert Crane Days
- Annual event held in mid-March in Eckert, to observe the Sandhill Crane migration.
- http://eckertcranedays.com

Bird Pictures by Bill Schmoker
- Gallery of high-quality digital photos, mostly from Colorado; tips on digiscoping techniques.
- http://www.schmoker.org/BirdPics/

Natural Diversity Information Source - Wildlife Species
- Lists of birds, mammals, amphibians, and reptiles for each county.
- http://ndis.nrel.colostate.edu/wildlife.asp

Colorado Bird-watching Sites
- Guide to 13 sites from National Geographic.
- http://www.nationalgeographic.com/destinations/Rocky_Mountain_National_Park/Colorado_Bird_watching_Sites.html

Rocky Mountain Bird Observatory
- Conservation and education projects, volunteer opportunities, Partners In Flight database and bird conservation plan, and news. Formerly Colorado Bird Observatory.
- http://rmbo.org/

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.
- http://www.cfo-link.org/

Birds of Prey Foundation
- Raptor rehabilitation organization based in Boulder County.
- http://www.birds-of-prey.org/