BirdAnalyst
BBS Route · Colorado · BCR 16

Falfa Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 125 species recorded across 42 survey years, still active.

125Species 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 →
42Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1971–2025Span
6Observers

Bird Species Found on Colorado Falfa

Top 40 of 125 species by most recent count. Each links to its species trend.

Species recorded on the Falfa 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
Red-winged BlackbirdIcteridae1652025-25%1973
House SparrowPasseridae712025+69%1973
Western MeadowlarkIcteridae652025+1%1973
European StarlingSturnidae572025+0%1973
Cliff SwallowHirundinidae222025+121%1973
Eurasian Collared-DoveColumbidae212025+556%2010
Western KingbirdTyrannidae20202517×1975
Black-billed MagpieCorvidae202025-79%1973
Western Wood-PeweeTyrannidae192025+314%1975
Canada GooseAnatidae152024-15%2001
Bullock's OrioleIcteridae142025+273%1973
American RobinTurdidae142025-25%1973
Mourning DoveColumbidae122025-60%1973
Common RavenCorvidae122025+300%1977
Brown-headed CowbirdIcteridae122025+100%1974
Woodhouse's Scrub-JayCorvidae82025-42%1973
Spotted TowheePasserellidae82025-50%1973
Black SwiftApodidae81987n/an/a
Lark SparrowPasserellidae72025+100%1973
Barn SwallowHirundinidae72025-78%1973
American CrowCorvidae62024+18%1974
Mountain BluebirdTurdidae62025+58%1973
Band-tailed PigeonColumbidae61980+500%1972
American KestrelFalconidae52025+75%1975
Chipping SparrowPasserellidae52025-69%1973
Lesser GoldfinchFringillidae52025+91%1977
Ash-throated FlycatcherTyrannidae42025+100%1973
Say's PhoebeTyrannidae42025+57%1973
Brewer's BlackbirdIcteridae42025-83%1973
House FinchFringillidae42025-52%1973
Blue GrosbeakCardinalidae42025-42%1973
Yellow WarblerParulidae42025-14%1973
White-breasted NuthatchSittidae42025+138%1974
Red-tailed HawkAccipitridae42025+100%1987
RedheadAnatidae41987n/an/a
KilldeerCharadriidae32025-85%1973
Pine SiskinFringillidae32003-33%1998
Black-headed GrosbeakCardinalidae32025-46%1973
Wilson's SnipeScolopacidae32025-71%1974
GadwallAnatidae31997n/an/a

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