BirdAnalyst
BBS Route · Colorado · BCR 16

Colona 2 Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 82 species recorded across 7 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 →
7Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
2015–2025Span
3Observers

Bird Species Found on Colorado Colona 2

Top 40 of 82 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
Warbling VireoVireonidae312025-48%2017
Brewer's BlackbirdIcteridae242025-33%2017
American RobinTurdidae232025-37%2017
Violet-green SwallowHirundinidae222025+27%2017
Western MeadowlarkIcteridae182025-34%2017
Cliff SwallowHirundinidae13202113×2015
Vesper SparrowPasserellidae122025-25%2017
Western TanagerCardinalidae102025+200%2016
Dusky FlycatcherTyrannidae82025+700%2015
Red-winged BlackbirdIcteridae82025+36%2017
Common GrackleIcteridae82021+150%2017
Red-naped SapsuckerPicidae72021+60%2016
Northern House WrenTroglodytidae72025-67%2016
European StarlingSturnidae72025-83%2017
House FinchFringillidae72021+133%2016
Red CrossbillFringillidae62016n/an/a
Orange-crowned WarblerParulidae62025+100%2016
Broad-tailed HummingbirdTrochilidae52025-33%2017
Western Wood-PeweeTyrannidae52025-39%2017
Common RavenCorvidae52025+0%2017
Ruby-crowned KingletRegulidae52025+133%2016
American KestrelFalconidae42021-47%2017
Clark's NutcrackerCorvidae42016+300%2015
Purple MartinHirundinidae42025-25%2017
Hermit ThrushTurdidae42025+300%2015
Mountain BluebirdTurdidae42025-39%2017
Chipping SparrowPasserellidae42025-46%2018
MallardAnatidae32019+100%2016
Red-tailed HawkAccipitridae32021+33%2016
Lewis's WoodpeckerPicidae32025+44%2018
Black-billed MagpieCorvidae32025-47%2017
Song SparrowPasserellidae32025-75%2016
Green-tailed TowheePasserellidae32025-65%2017
Yellow WarblerParulidae32025-36%2017
White-crowned SparrowPasserellidae32021+200%2016
Dusky GrousePhasianidae22021+100%2015
Downy WoodpeckerPicidae22017+100%2015
Horned LarkAlaudidae22025-39%2017
American CrowCorvidae22025-73%2017
Brewer's SparrowPasserellidae22017+100%2015

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14. A route is a sample, not a census.