BirdAnalyst
BBS Route · Colorado · BCR 16

Cortez Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 132 species recorded across 21 survey years, no longer active.

132Species 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 →
21Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1988–2008Span
1Observers

Bird Species Found on Colorado Cortez

Top 40 of 132 species by most recent count. Each links to its species trend.

Species recorded on the Cortez 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
House SparrowPasseridae342008+252%1991
Canada GooseAnatidae332008+6%1990
Red-winged BlackbirdIcteridae332008-20%1990
Cliff SwallowHirundinidae322008-29%1991
Western MeadowlarkIcteridae282008+11%1990
Western KingbirdTyrannidae262008+129%1990
Rock PigeonColumbidae222008-17%1990
House FinchFringillidae212008+92%1990
American RobinTurdidae212008-44%1990
Mourning DoveColumbidae172008+4%1990
Bullock's OrioleIcteridae172008+5%1990
Brewer's BlackbirdIcteridae132008-64%1990
Yellow WarblerParulidae132008+16%1990
Pygmy NuthatchSittidae122005+20%2001
Northern Rough-winged SwallowHirundinidae112008-91%1990
Tree SwallowHirundinidae102008-62%1990
BushtitAegithalidae102008+43%1992
Pied-billed GrebePodicipedidae102008+267%1993
Western Wood-PeweeTyrannidae102008-3%1992
Lesser GoldfinchFringillidae102008+367%1999
American KestrelFalconidae92008+82%1990
Eurasian Collared-DoveColumbidae82008+167%2006
Spotted TowheePasserellidae72008+71%1990
Barn SwallowHirundinidae72008-90%1990
Band-tailed PigeonColumbidae71992n/an/a
MallardAnatidae62008+77%1990
White-throated SwiftApodidae62006-22%1989
Black-billed MagpieCorvidae62008-41%1990
Black-headed GrosbeakCardinalidae62008+25%1990
Northern MockingbirdMimidae62008-20%1990
Wilson's WarblerParulidae62005+167%2002
Cinnamon TealAnatidae52007-31%1990
American CootRallidae52008+36%1990
Brown-headed CowbirdIcteridae52008-67%1990
Mountain BluebirdTurdidae52008+83%1991
White-faced IbisThreskiornithidae52003+125%1993
Common RavenCorvidae42008-38%1991
Chipping SparrowPasserellidae42008-68%1990
Blue-gray GnatcatcherPolioptilidae42008+229%1990
GadwallAnatidae42007+13%1992

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