BirdAnalyst
BBS Route · Colorado · BCR 16

Colona 2 Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 76 species recorded across 6 survey years, still active.

76Species 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 →
6Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
2015–2021Span
2Observers

Bird Species Found on Colorado Colona 2

Top 40 of 76 species by most recent count. Each links to its species trend.

Species recorded on the Colona 2 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
Violet-green SwallowHirundinidae612021+16%2017
American RobinTurdidae242021-32%2017
Western MeadowlarkIcteridae212021-42%2017
Brewer's BlackbirdIcteridae172021-54%2017
Red-winged BlackbirdIcteridae132021+41%2017
Cliff SwallowHirundinidae13202113×2015
Vesper SparrowPasserellidae112021-53%2017
Common GrackleIcteridae82021+150%2017
Red-naped SapsuckerPicidae72021+60%2016
House FinchFringillidae72021+133%2016
Lewis's WoodpeckerPicidae62021+100%2017
Purple MartinHirundinidae62021+165%2017
Red CrossbillFringillidae62016n/an/a
Turkey VultureCathartidae52021+100%2017
Western Wood-PeweeTyrannidae52021-56%2017
Horned LarkAlaudidae52021-25%2016
Pine SiskinFringillidae52016-17%2015
Mountain BluebirdTurdidae52021+22%2017
European StarlingSturnidae52021-88%2017
Brown-headed CowbirdIcteridae52021+67%2016
Cassin's FinchFringillidae52018+67%2016
American KestrelFalconidae42021-47%2017
Clark's NutcrackerCorvidae42016+300%2015
Hermit ThrushTurdidae42016+300%2015
Mourning DoveColumbidae42021+0%2016
Chipping SparrowPasserellidae42021+100%2017
MallardAnatidae32019+100%2016
Red-tailed HawkAccipitridae32021+33%2016
Black-billed MagpieCorvidae32019-55%2016
White-crowned SparrowPasserellidae32021+200%2016
Dusky GrousePhasianidae22021+100%2015
Downy WoodpeckerPicidae22017+100%2015
Common RavenCorvidae22021-38%2017
American CrowCorvidae22021-67%2017
Brewer's SparrowPasserellidae22017+100%2015
Western TanagerCardinalidae22021-25%2016
Tree SwallowHirundinidae22021-71%2015
Yellow WarblerParulidae22021-50%2016
Wilson's WarblerParulidae22016+100%2015
White-breasted NuthatchSittidae22021+100%2015

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