BirdAnalyst
BBS Route · Colorado · BCR 18

Abarr Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 82 species recorded across 49 survey years, still active.

82Species 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 →
49Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1968–2024Span
6Observers

Bird Species Found on Colorado Abarr

Top 40 of 82 species by most recent count. Each links to its species trend.

Species recorded on the Abarr 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 MeadowlarkIcteridae1782024-24%1970
Horned LarkAlaudidae1112024-52%1970
Mourning DoveColumbidae562024-14%1970
Cassin's SparrowPasserellidae292024-31%1972
Red-winged BlackbirdIcteridae282024+150%1970
Common GrackleIcteridae27202318×1976
Lark BuntingPasserellidae202024-57%1970
Grasshopper SparrowPasserellidae172024+108%1970
Common NighthawkCaprimulgidae152024+238%1972
House SparrowPasseridae142024-76%1970
Brown-headed CowbirdIcteridae82024+73%1971
Savannah SparrowPasserellidae81969n/an/a
Ring-necked PheasantPhasianidae72024-85%1970
Lark SparrowPasserellidae72024-9%1970
Northern MockingbirdMimidae72024+31%1970
Western KingbirdTyrannidae62024-22%1970
Eastern KingbirdTyrannidae62024-20%1972
Eurasian Collared-DoveColumbidae62024+700%2010
European StarlingSturnidae52024-78%1971
Brewer's BlackbirdIcteridae52023+225%1974
Barn SwallowHirundinidae42024-53%1970
American RobinTurdidae42024+80%1986
Brewer's SparrowPasserellidae31998-94%1970
KilldeerCharadriidae22024+0%1970
Northern HarrierAccipitridae21999+0%1974
Black-billed MagpieCorvidae21999-64%1971
Cliff SwallowHirundinidae2202412×1971
Northern Rough-winged SwallowHirundinidae22014-13%1976
Red-headed WoodpeckerPicidae22024-33%1975
Sage ThrasherMimidae21969n/an/a
Red-tailed HawkAccipitridae22024+67%1984
Bullock's OrioleIcteridae22024-46%1972
MallardAnatidae22021+0%1975
American GoldfinchFringillidae21992+100%1978
Blue GrosbeakCardinalidae22023+25%1984
Long-eared OwlStrigidae21983n/an/a
Wood DuckAnatidae21985n/an/a
Greater Prairie-ChickenPhasianidae2202312×1988
Wild TurkeyPhasianidae22016+125%2004
Upland SandpiperScolopacidae12024-40%1972

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