BirdAnalyst
BBS Route · Colorado · BCR 18

Trinchera Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 84 species recorded across 27 survey years, still active.

84Species 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 →
1990–2025Span
5Observers

Bird Species Found on Colorado Trinchera

Top 40 of 84 species by most recent count. Each links to its species trend.

Species recorded on the Trinchera 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 MeadowlarkIcteridae1492025-15%1993
Cliff SwallowHirundinidae632025-33%1993
Lark SparrowPasserellidae412025-29%1993
Northern MockingbirdMimidae352025+736%1993
Mourning DoveColumbidae272025-4%1993
Cassin's SparrowPasserellidae202025-57%1993
Horned LarkAlaudidae122025-43%1993
Common RavenCorvidae102022+11%1993
Black-headed GrosbeakCardinalidae102025+40%1994
Pinyon JayCorvidae62021-79%1994
Bullock's OrioleIcteridae52025+23%1996
Ash-throated FlycatcherTyrannidae52025+63%2019
American CrowCorvidae42025-43%1993
Spotted TowheePasserellidae42025-60%1993
Blue GrosbeakCardinalidae42025+278%1997
Turkey VultureCathartidae42021+300%1994
Wild TurkeyPhasianidae42025+92%2013
Burrowing OwlStrigidae42022+300%2018
Chihuahuan RavenCorvidae42025+100%2018
American KestrelFalconidae32022-25%1993
Common NighthawkCaprimulgidae32025-81%1993
Western KingbirdTyrannidae32025+25%1997
Say's PhoebeTyrannidae32025+22%1994
Black-billed MagpieCorvidae32021+0%2000
Brown-headed CowbirdIcteridae32022-45%1995
Red-winged BlackbirdIcteridae32025-55%1994
Common GrackleIcteridae32025-47%2001
Rock WrenTroglodytidae32025+60%2012
Brewer's BlackbirdIcteridae32021-82%1994
Yellow-headed BlackbirdIcteridae31993n/an/a
Golden EagleAccipitridae32000+50%1999
Mountain BluebirdTurdidae32021+133%2004
Yellow WarblerParulidae32025+160%2019
Yellow-breasted ChatIcteriidae32025+233%2021
Great Horned OwlStrigidae22021-50%1990
Woodhouse's Scrub-JayCorvidae22025+67%1994
European StarlingSturnidae22022+367%1993
House FinchFringillidae22025+150%1994
Lesser GoldfinchFringillidae22025-25%1995
Barn SwallowHirundinidae22025-13%1995

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