BirdAnalyst
BBS Route · Colorado · BCR 18

Last Chance 2 Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 45 species recorded across 6 survey years, still active.

45Species 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 →
2017–2024Span
2Observers

Bird Species Found on Colorado Last Chance 2

Top 40 of 45 species by most recent count. Each links to its species trend.

Species recorded on the Last Chance 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
Horned LarkAlaudidae2092024-31%2019
Western MeadowlarkIcteridae1612024-26%2019
Lark BuntingPasserellidae1032024-1%2019
Mourning DoveColumbidae772024-24%2019
Red-winged BlackbirdIcteridae362024-14%2019
Western KingbirdTyrannidae342024-34%2019
House SparrowPasseridae322024+388%2018
Burrowing OwlStrigidae202024-29%2019
Common GrackleIcteridae112024-31%2018
Swainson's HawkAccipitridae82024-43%2019
Yellow-headed BlackbirdIcteridae82021+100%2017
Say's PhoebeTyrannidae72024+36%2019
American RobinTurdidae72024+300%2021
Red-tailed HawkAccipitridae62024-40%2019
Loggerhead ShrikeLaniidae62024-50%2019
KilldeerCharadriidae52024+71%2018
Brewer's BlackbirdIcteridae42022+108%2019
Northern HarrierAccipitridae32024+138%2019
Cassin's SparrowPasserellidae32024+50%2017
Vesper SparrowPasserellidae32019+200%2018
MallardAnatidae32024+50%2019
Ferruginous HawkAccipitridae32022n/an/a
American KestrelFalconidae22024+0%2018
European StarlingSturnidae22024+7%2018
Lesser GoldfinchFringillidae22022+0%2018
Ring-necked PheasantPhasianidae12019+0%2017
Bullock's OrioleIcteridae12024+0%2019
Grasshopper SparrowPasserellidae12024-75%2018
Lark SparrowPasserellidae12024-13%2018
Brewer's SparrowPasserellidae12018-80%2017
Barn SwallowHirundinidae12024-50%2019
Gray CatbirdMimidae12017n/an/a
Brown ThrasherMimidae12019-67%2017
Eurasian Collared-DoveColumbidae12024-29%2018
Brown-headed CowbirdIcteridae12022-50%2019
Orchard OrioleIcteridae12024+0%2018
Yellow-breasted ChatIcteriidae12019+0%2018
Northern MockingbirdMimidae12024-63%2021
Eastern KingbirdTyrannidae12024-50%2019
Black-headed GrosbeakCardinalidae12021n/an/a

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