BirdAnalyst
BBS Route · Colorado · BCR 18

Crowley Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 72 species recorded across 29 survey years, still active.

72Species 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 →
29Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1989–2024Span
4Observers

Bird Species Found on Colorado Crowley

Top 40 of 72 species by most recent count. Each links to its species trend.

Species recorded on the Crowley 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
Western MeadowlarkIcteridae1632024-27%1992
Horned LarkAlaudidae1122024-54%1992
Cassin's SparrowPasserellidae1112024-15%1992
Northern MockingbirdMimidae912024+169%1992
Mourning DoveColumbidae692024+1%1992
Lark SparrowPasserellidae312024-41%1992
Bullock's OrioleIcteridae242024+73%1992
House SparrowPasseridae172024-54%1992
Western KingbirdTyrannidae162024+7%1992
Loggerhead ShrikeLaniidae162024+230%1993
Swainson's HawkAccipitridae82024-53%1992
European StarlingSturnidae72024+150%1992
Chihuahuan RavenCorvidae72023+83%2011
Red-tailed HawkAccipitridae62024+150%1992
Brewer's SparrowPasserellidae61994+500%1989
Common RavenCorvidae52024+175%1997
Red-winged BlackbirdIcteridae52024+100%1994
Common GrackleIcteridae42023-59%1992
Greater RoadrunnerCuculidae42010+100%1996
KilldeerCharadriidae32023-63%1992
Scaled QuailOdontophoridae32024-86%1992
Ferruginous HawkAccipitridae32024-40%1992
Common NighthawkCaprimulgidae32024-82%1992
Say's PhoebeTyrannidae32024-46%1994
Brown-headed CowbirdIcteridae32024+11%1993
Grasshopper SparrowPasserellidae32023-36%1999
Mountain PloverCharadriidae22003-54%1992
Rock PigeonColumbidae22024-82%1997
American KestrelFalconidae22018-40%1992
Lark BuntingPasserellidae22024-76%1992
Barn SwallowHirundinidae22024-45%1992
American RobinTurdidae22024-25%1992
Curve-billed ThrasherMimidae22024+125%1993
Blue-winged TealAnatidae21999+0%1992
Blue GrosbeakCardinalidae22024-29%1995
Northern House WrenTroglodytidae22023+67%2002
Cassin's KingbirdTyrannidae22022+100%2004
Sage ThrasherMimidae22017+0%2003
Cliff SwallowHirundinidae22024+56%2008
Eurasian Collared-DoveColumbidae22024+50%2012

Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22. A route is a sample, not a census.