BirdAnalyst
BBS Route · Colorado · BCR 18

Prospect Valley 2 Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 56 species recorded across 22 survey years, still active.

56Species 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 →
22Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
2001–2023Span
2Observers

Bird Species Found on Colorado Prospect Valley 2

Top 40 of 56 species by most recent count. Each links to its species trend.

Species recorded on the Prospect Valley 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 LarkAlaudidae2442023+132%2003
Western MeadowlarkIcteridae1382023+80%2003
Mourning DoveColumbidae1112023-7%2003
Red-winged BlackbirdIcteridae542023+39%2003
Northern PintailAnatidae502008n/an/a
Western KingbirdTyrannidae442023-66%2003
Common GrackleIcteridae422023-68%2003
Lark BuntingPasserellidae382023-79%2003
European StarlingSturnidae232023-37%2003
House SparrowPasseridae132023-43%2003
American RobinTurdidae122023-7%2003
Great-tailed GrackleIcteridae92010-74%2001
Eurasian Collared-DoveColumbidae82023+46%2012
Canada GooseAnatidae72021+73%2016
Cassin's SparrowPasserellidae62019+500%2017
MallardAnatidae52021-44%2003
Barn SwallowHirundinidae52023+100%2004
Rock PigeonColumbidae52023+131%2005
Swainson's HawkAccipitridae52023-31%2004
Say's PhoebeTyrannidae52023+83%2008
Red-tailed HawkAccipitridae42023+43%2008
Northern MockingbirdMimidae42023+17%2004
Western Wood-PeweeTyrannidae42022+450%2008
Burrowing OwlStrigidae42023-46%2009
Brown-headed CowbirdIcteridae42023+300%2015
Northern HarrierAccipitridae32022-11%2005
Bullock's OrioleIcteridae32023+60%2005
Loggerhead ShrikeLaniidae32023-76%2003
KilldeerCharadriidae22023-55%2003
Great Horned OwlStrigidae22023-50%2003
House FinchFringillidae22023-49%2003
Lark SparrowPasserellidae22023+25%2004
Northern House WrenTroglodytidae22021+150%2002
White-winged DoveColumbidae22011n/an/a
Vesper SparrowPasserellidae22018n/an/a
Ferruginous HawkAccipitridae12019+0%2002
Golden EagleAccipitridae12004+0%2001
Prairie FalconFalconidae12015+0%2002
Eastern KingbirdTyrannidae12018+0%2004
Black-billed MagpieCorvidae12022-80%2003

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