BirdAnalyst
BBS Route · Colorado · BCR 18

Flagler Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 65 species recorded across 18 survey years, still active.

65Species 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 →
18Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1997–2024Span
3Observers

Bird Species Found on Colorado Flagler

Top 40 of 65 species by most recent count. Each links to its species trend.

Species recorded on the Flagler 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 MeadowlarkIcteridae1072024-37%2001
Horned LarkAlaudidae962024-25%2001
Mourning DoveColumbidae602024-24%2001
Red-winged BlackbirdIcteridae552024-31%2001
Common GrackleIcteridae422024+13%2001
House SparrowPasseridae412024+9%2001
European StarlingSturnidae222024+107%2001
Rock PigeonColumbidae192024+13%2002
Eurasian Collared-DoveColumbidae13202412×2006
Western KingbirdTyrannidae122024-39%2001
Lark BuntingPasserellidae122024-62%2001
Northern MockingbirdMimidae82024+82%2003
Blue-winged TealAnatidae82023-11%2007
Cliff SwallowHirundinidae62024-80%2007
Great-tailed GrackleIcteridae52024+39%2001
American RobinTurdidae52024-39%2001
KilldeerCharadriidae42024-40%2001
Ring-necked PheasantPhasianidae42024-82%2001
Barn SwallowHirundinidae42024+22%2001
Yellow-headed BlackbirdIcteridae42003+100%2002
Northern ShovelerAnatidae42009n/an/a
Great Blue HeronArdeidae32003+200%1997
Swainson's HawkAccipitridae32023-44%2001
Brown-headed CowbirdIcteridae32024-29%2001
White-faced IbisThreskiornithidae32012n/an/a
Burrowing OwlStrigidae22024+60%2002
Grasshopper SparrowPasserellidae22023-96%2001
Lark SparrowPasserellidae22022-59%2003
Northern Rough-winged SwallowHirundinidae22007-20%2000
Green-winged TealAnatidae22023+0%2000
Northern PintailAnatidae22003+100%2000
American CrowCorvidae22003-33%2000
Red-tailed HawkAccipitridae22023+33%2005
Great Horned OwlStrigidae22022+50%2006
American GoldfinchFringillidae22007n/an/a
Blue GrosbeakCardinalidae22024+100%2023
Mississippi KiteAccipitridae22024n/an/a
MallardAnatidae12023-87%2001
Northern HarrierAccipitridae12007-33%2001
Common NighthawkCaprimulgidae12012-50%2001

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