BirdAnalyst
BBS Route · Colorado · BCR 16

Dunckley Pas Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 87 species recorded across 33 survey years, still active.

87Species 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 →
33Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1992–2025Span
3Observers

Bird Species Found on Colorado Dunckley Pas

Top 40 of 87 species by most recent count. Each links to its species trend.

Species recorded on the Dunckley Pas 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
Warbling VireoVireonidae592025+32%1994
American RobinTurdidae472025+8%1994
Violet-green SwallowHirundinidae442025+200%1994
White-crowned SparrowPasserellidae252025+50%1994
Pine SiskinFringillidae222025+180%1995
Western TanagerCardinalidae222025+540%1994
Ruby-crowned KingletRegulidae202025-25%1994
Western Wood-PeweeTyrannidae142025+8%1994
Hermit ThrushTurdidae142025+82%1994
Chipping SparrowPasserellidae132025+82%2007
Broad-tailed HummingbirdTrochilidae122025+90%1994
MacGillivray's WarblerParulidae122025+71%1995
Red-naped SapsuckerPicidae112025+114%1994
Lincoln's SparrowPasserellidae112025-5%1994
Green-tailed TowheePasserellidae112025-26%1994
Yellow WarblerParulidae102025+86%1994
Mountain ChickadeeParidae102025+155%1996
Northern House WrenTroglodytidae92025+37%1994
Common RavenCorvidae72024+120%1997
Black-headed GrosbeakCardinalidae72025+67%1996
Song SparrowPasserellidae72025+10%1995
Lark SparrowPasserellidae72025+80%2023
Black-billed MagpieCorvidae42025+175%1994
Red CrossbillFringillidae42025+20%2022
Orange-crowned WarblerParulidae42025+75%2003
Brewer's BlackbirdIcteridae42016+33%2010
Green-winged TealAnatidae32011+50%1992
Dusky FlycatcherTyrannidae32025+33%1994
Brown-headed CowbirdIcteridae32025-54%1997
Tree SwallowHirundinidae32025-67%1994
Swainson's ThrushTurdidae32025-17%1994
Mountain BluebirdTurdidae32025-43%1994
Cliff SwallowHirundinidae32024-69%1997
American CrowCorvidae32023+50%1998
Brewer's SparrowPasserellidae32025+100%2007
Cassin's FinchFringillidae22024-43%1994
American GoldfinchFringillidae22025+25%2021
Fox SparrowPasserellidae22025-55%1994
Townsend's SolitaireTurdidae22025+25%1998
Sandhill CraneGruidae22023+100%2003

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