BirdAnalyst
BBS Route · Colorado · BCR 16

Flattops Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 102 species recorded across 29 survey years, still active.

102Species 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 →
1992–2025Span
4Observers

Bird Species Found on Colorado Flattops

Top 40 of 102 species by most recent count. Each links to its species trend.

Species recorded on the Flattops 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
American RobinTurdidae442025-14%1994
Warbling VireoVireonidae412025-43%1994
White-crowned SparrowPasserellidae292025+28%1995
Northern House WrenTroglodytidae192025+76%1994
Common RavenCorvidae172025+667%1994
Hermit ThrushTurdidae152025-63%1994
Ruby-crowned KingletRegulidae132025-9%1994
Western Wood-PeweeTyrannidae122025+30%1994
Western TanagerCardinalidae122025-50%1994
MacGillivray's WarblerParulidae122025+133%1996
Pine SiskinFringillidae112025-59%1994
American CrowCorvidae102025+460%1996
Violet-green SwallowHirundinidae92025+100%1994
Chipping SparrowPasserellidae82025+5%1994
Mountain ChickadeeParidae82025+125%1995
Evening GrosbeakFringillidae82017n/an/a
Red CrossbillFringillidae72025+16%2002
American GoldfinchFringillidae72006+8%2004
Mourning DoveColumbidae62025+67%1995
House FinchFringillidae62010+50%2004
Broad-tailed HummingbirdTrochilidae52025-29%1994
Song SparrowPasserellidae52025-42%1995
Swainson's ThrushTurdidae52025-18%1994
Black-billed MagpieCorvidae42025+82%1996
Black-headed GrosbeakCardinalidae42025+67%1996
Bullock's OrioleIcteridae42014+80%2000
Cliff SwallowHirundinidae42003+100%2000
Swainson's HawkAccipitridae32019-17%2005
Green-tailed TowheePasserellidae32025+25%1994
Tree SwallowHirundinidae32019+124%1994
Pine GrosbeakFringillidae32015+29%1996
Wild TurkeyPhasianidae32019+150%2004
Red-naped SapsuckerPicidae22025+20%1994
Common NighthawkCaprimulgidae22025-38%1994
Canada JayCorvidae22019+17%1994
Lincoln's SparrowPasserellidae22025+114%1995
Virginia's WarblerParulidae22018+0%2004
Orange-crowned WarblerParulidae22019+0%1995
Red-breasted NuthatchSittidae22025-50%1994
Mountain BluebirdTurdidae22025-33%1995

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