BirdAnalyst
BBS Route · Colorado · BCR 18

Briggsdale Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 71 species recorded across 45 survey years, still active.

71Species 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 →
45Years 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
7Observers

Bird Species Found on Colorado Briggsdale

Top 40 of 71 species by most recent count. Each links to its species trend.

Species recorded on the Briggsdale 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
Horned LarkAlaudidae4032024+174%1970
Western MeadowlarkIcteridae1262024+90%1970
California GullLaridae95202329×1986
Lark BuntingPasserellidae902024-66%1970
Mourning DoveColumbidae812024+85%1970
Brewer's BlackbirdIcteridae352008+217%2003
House SparrowPasseridae272024+219%1970
Common GrackleIcteridae242024+507%1970
Eurasian Collared-DoveColumbidae172024+100%2019
Black TernLaridae151995n/an/a
Rock PigeonColumbidae142024-23%1970
Western KingbirdTyrannidae142024-2%1970
Red-winged BlackbirdIcteridae122024+380%1970
Blue-winged TealAnatidae112023+450%1980
Ring-billed GullLaridae112023+175%1991
Swainson's HawkAccipitridae102024+264%1970
Burrowing OwlStrigidae102024+156%1970
Grasshopper SparrowPasserellidae102024+270%1970
Wilson's PhalaropeScolopacidae101996+233%1989
European StarlingSturnidae82024-17%1970
Thick-billed LongspurCalcariidae82007+232%1972
Brown-headed CowbirdIcteridae82024+200%1993
Barn SwallowHirundinidae72024+67%1970
Common NighthawkCaprimulgidae62021+120%1980
Say's PhoebeTyrannidae52024-13%1971
Cassin's SparrowPasserellidae52024+120%1970
Chestnut-collared LongspurCalcariidae52008+580%1987
Great Horned OwlStrigidae52024+0%1986
American White PelicanPelecanidae52024-72%1997
Green-winged TealAnatidae52023n/an/a
KilldeerCharadriidae42024+20%1970
Lark SparrowPasserellidae42024+225%1973
American AvocetRecurvirostridae42024+150%1978
Northern PintailAnatidae41989-43%1983
Ring-necked PheasantPhasianidae32002-90%1970
Northern HarrierAccipitridae32021-22%1970
Black-billed MagpieCorvidae32005+67%1970
Loggerhead ShrikeLaniidae32024+0%1972
American RobinTurdidae32024+233%1991
Yellow-headed BlackbirdIcteridae31990n/an/a

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