BirdAnalyst
BBS Route · Colorado · BCR 18

Boyero Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 64 species recorded across 27 survey years, still active.

64Species 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 →
27Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1979–2017Span
6Observers

Bird Species Found on Colorado Boyero

Top 40 of 64 species by most recent count. Each links to its species trend.

Species recorded on the Boyero 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 MeadowlarkIcteridae1382017-23%1982
Horned LarkAlaudidae1142017-58%1982
Lark BuntingPasserellidae922017-78%1982
Cassin's SparrowPasserellidae872017-49%1982
Mourning DoveColumbidae462017-47%1982
Cliff SwallowHirundinidae322017+253%2003
Lark SparrowPasserellidae292017+81%1986
Western KingbirdTyrannidae202017-56%1982
Burrowing OwlStrigidae162017+767%1986
European StarlingSturnidae162017-4%1988
Brown-headed CowbirdIcteridae162017+80%1989
MallardAnatidae102010+70%1994
House SparrowPasseridae92017-23%1982
Bullock's OrioleIcteridae82017+240%1982
KilldeerCharadriidae52017+25%1982
House FinchFringillidae51982+67%1981
Northern MockingbirdMimidae52017+9%1986
Brewer's SparrowPasserellidae52017-10%1990
Swainson's HawkAccipitridae42017+0%1982
Grasshopper SparrowPasserellidae42017+22%1982
Loggerhead ShrikeLaniidae42017-8%1988
DickcisselCardinalidae42017+25%1995
Common NighthawkCaprimulgidae32017+14%1982
Red-winged BlackbirdIcteridae32017-35%1982
Barn SwallowHirundinidae32017-48%1982
Scaled QuailOdontophoridae32017-40%1988
Rock PigeonColumbidae32017+25%1991
Brown ThrasherMimidae32016+67%1997
Mountain PloverCharadriidae22017-14%1992
Red-tailed HawkAccipitridae22017+180%1990
Eastern KingbirdTyrannidae22017+17%1986
Say's PhoebeTyrannidae22017-14%1982
Ring-necked PheasantPhasianidae22016+33%1988
Blue GrosbeakCardinalidae22017-67%1993
American RobinTurdidae22012+25%1995
Northern BobwhiteOdontophoridae21993+100%1990
Northern Rough-winged SwallowHirundinidae22009-29%1996
Orchard OrioleIcteridae22017+160%2003
Wild TurkeyPhasianidae22009+100%2003
Eurasian Collared-DoveColumbidae22017-29%2012

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