BirdAnalyst
BBS Route · Colorado · BCR 16

Guffey Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 123 species recorded across 28 survey years, still active.

123Species RecordedSpecies recordedDistinct species detected on standard-protocol BBS runs here across all years on record — a measure of survey breadth, not a complete checklist.Full methodology →
28Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1990–2025Span
2Observers

Bird Species Found on Colorado Guffey

Top 40 of 123 species by most recent count. Each links to its species trend.

Species recorded on the Guffey route.
Recent countThe raw number of individuals recorded on this route in its most recent survey year. A single-route tally, not a trend.Full methodology →TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →Baseline yearThe first year of the smoothed window the trend is measured from. An earlier baseline means a longer record stands behind the number.Full methodology →History
California GullLaridae946202517×1994
American White PelicanPelecanidae407202526×1995
Double-crested CormorantPhalacrocoracidae2722025+908%1999
Pinyon JayCorvidae137202520×1993
Canada GooseAnatidae632025-54%1992
Western MeadowlarkIcteridae512025+64%1992
American CootRallidae51202251×2015
Brewer's BlackbirdIcteridae352025+33%1992
American RobinTurdidae302025+37%1992
Horned LarkAlaudidae292025-13%1992
Ruddy DuckAnatidae252015n/an/a
Red-winged BlackbirdIcteridae242025+225%1992
Common RavenCorvidae202025+346%1992
Clark's NutcrackerCorvidae152025+367%1992
Western Wood-PeweeTyrannidae122025+56%1992
Violet-green SwallowHirundinidae122025+227%1992
Vesper SparrowPasserellidae122025-4%1993
American CrowCorvidae112025+6%1994
Mountain BluebirdTurdidae92025+12%1992
Mourning DoveColumbidae92025+113%1994
Steller's JayCorvidae82025+12%1992
Red CrossbillFringillidae82024+7%1996
RedheadAnatidae82016n/an/a
Brown-headed CowbirdIcteridae72025+16%1992
Chipping SparrowPasserellidae72025-72%1992
Western BluebirdTurdidae72025+100%1992
Broad-tailed HummingbirdTrochilidae62025+433%1992
Black-billed MagpieCorvidae62025+30%1992
Mountain ChickadeeParidae62025+100%1992
Warbling VireoVireonidae62025+567%1997
Tree SwallowHirundinidae52025+75%1992
Rock WrenTroglodytidae52025+21%1997
Ruby-crowned KingletRegulidae52025+433%2006
House SparrowPasseridae52022-15%2009
European StarlingSturnidae42021+125%1999
Green-tailed TowheePasserellidae42025+600%1993
GadwallAnatidae42025+14%1996
Western GrebePodicipedidae42025+860%2001
Black-headed GrosbeakCardinalidae42025+200%1999
Blue-gray GnatcatcherPolioptilidae41997n/an/a

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14. A route is a sample, not a census.