BirdAnalyst
BBS Route · Colorado · BCR 16

Cortez 2 Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 106 species recorded across 7 survey years, no longer active.

106Species 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 →
7Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
2009–2017Span
2Observers

Bird Species Found on Colorado Cortez 2

Top 40 of 106 species by most recent count. Each links to its species trend.

Species recorded on the Cortez 2 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
European StarlingSturnidae962017+10%2013
Red-winged BlackbirdIcteridae622017+12%2013
Common RavenCorvidae502017+458%2013
House SparrowPasseridae382017-46%2013
American RobinTurdidae312017+17%2013
Western Wood-PeweeTyrannidae292017+70%2013
Western KingbirdTyrannidae282017+24%2013
Cliff SwallowHirundinidae272017-27%2013
Western MeadowlarkIcteridae252017+9%2013
Eurasian Collared-DoveColumbidae252017+100%2013
Canada GooseAnatidae222017+2%2013
Brewer's BlackbirdIcteridae222017-35%2013
Mourning DoveColumbidae192017+43%2013
Steller's JayCorvidae192009n/an/a
Black-billed MagpieCorvidae182017-7%2013
Spotted TowheePasserellidae152017+100%2013
House FinchFringillidae132017+100%2013
Bullock's OrioleIcteridae122017-17%2013
Ring-billed GullLaridae122013n/an/a
Green-winged TealAnatidae122015n/an/a
Barn SwallowHirundinidae112017+106%2013
Yellow WarblerParulidae102017-15%2013
Woodhouse's Scrub-JayCorvidae102017+71%2014
American CrowCorvidae92017+42%2013
Rock PigeonColumbidae82016-71%2010
Chipping SparrowPasserellidae82017+24%2013
Cassin's FinchFringillidae82014n/an/a
MallardAnatidae52017-52%2013
American KestrelFalconidae52017+117%2013
Say's PhoebeTyrannidae52017+29%2013
Dusky FlycatcherTyrannidae52017-5%2014
Pine SiskinFringillidae52017+100%2010
Warbling VireoVireonidae52017+80%2013
Virginia's WarblerParulidae52017+400%2009
White-breasted NuthatchSittidae52017+38%2013
Blue-gray GnatcatcherPolioptilidae52017+114%2013
Western GrebePodicipedidae52017-9%2014
Ruddy DuckAnatidae52015+400%2013
Western TanagerCardinalidae52017+400%2015
American CootRallidae42017-76%2013

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