The Birds of Grand County, Colorado Field Checklist is list of 252 species (144 breeding species), creasted using records from the U.S. Forest Service's Sulphur Ranger District, Audubon’s Christmas Bird Count, Colorado Field Ornithologists, Denver Museum of Nature & Science (Dr. John Demboski, Curator of Vertebrate Zoology), sighting reports from local observers and work done by several authors In most cases, single sighting records and records prior to 1940 have been omitted.Species are listed by common names in taxonomic order as set by the AmericanOrnithologists Union, North American Classification Committee’s Checklist of North American Birds, 7th Edition, 50th Supplement (7 AUG 2009).