BirdAnalyst
BBS Route · Colorado · BCR 18

Adams Co. Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 71 species recorded across 29 survey years, still active.

71Species 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 →
29Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1989–2022Span
4Observers

Bird Species Found on Colorado Adams Co.

Top 40 of 71 species by most recent count. Each links to its species trend.

Species recorded on the Adams Co. 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 LarkAlaudidae1732022-25%1991
Western MeadowlarkIcteridae1632022+81%1991
Mourning DoveColumbidae1052022+49%1991
House SparrowPasseridae812022-30%1991
Red-winged BlackbirdIcteridae722022-23%1991
Common GrackleIcteridae272022-58%1991
Rock PigeonColumbidae262022-6%1991
Eurasian Collared-DoveColumbidae242022+783%2006
European StarlingSturnidae202022+21%1991
American RobinTurdidae162022+100%1991
Western KingbirdTyrannidae132022-33%1991
Canada GooseAnatidae12200212×1997
Loggerhead ShrikeLaniidae112022+0%1991
KilldeerCharadriidae82022+280%1991
Red-tailed HawkAccipitridae82022+180%1998
American GoldfinchFringillidae82022+57%2003
Lark BuntingPasserellidae72022-43%1991
Grasshopper SparrowPasserellidae72021-56%1999
Swainson's HawkAccipitridae62022+100%1991
Northern HarrierAccipitridae52021+80%1992
Brewer's BlackbirdIcteridae5202217×1991
Say's PhoebeTyrannidae52022+350%1999
Savannah SparrowPasserellidae52019-91%2016
Bullock's OrioleIcteridae42022-14%1993
House FinchFringillidae42022+14%1995
Black-billed MagpieCorvidae32022+125%1995
American KestrelFalconidae32022+25%1993
Burrowing OwlStrigidae32022+650%2001
Cassin's SparrowPasserellidae32015+160%2006
Blue GrosbeakCardinalidae32021+200%2015
Chestnut-collared LongspurCalcariidae32016n/an/a
MallardAnatidae22016-55%1997
Lark SparrowPasserellidae22021+200%1991
Barn SwallowHirundinidae22022-94%1991
Brown-headed CowbirdIcteridae22022+18%1995
Cliff SwallowHirundinidae22019-57%2001
Yellow WarblerParulidae22021+0%2005
Northern MockingbirdMimidae22022-30%2000
Blue JayCorvidae22021+33%2009
Black-headed GrosbeakCardinalidae21998n/an/a

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