BirdAnalyst
BBS Route · Colorado · BCR 16

Tarryall Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 117 species recorded across 28 survey years, still active.

117Species 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 →
28Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1988–2023Span
4Observers

Bird Species Found on Colorado Tarryall

Top 40 of 117 species by most recent count. Each links to its species trend.

Species recorded on the Tarryall 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 White PelicanPelecanidae552023+813%2008
Canada GooseAnatidae522023+278%1990
Cliff SwallowHirundinidae262023-51%1990
American RobinTurdidae222023-48%1990
Red-winged BlackbirdIcteridae172023-63%1990
Double-crested CormorantPhalacrocoracidae132023+314%2016
Brewer's BlackbirdIcteridae112023+0%1990
Brown-headed CowbirdIcteridae102023-3%1990
Black-billed MagpieCorvidae82023+139%1990
Tree SwallowHirundinidae82023+133%1992
Warbling VireoVireonidae82023-21%1990
Broad-tailed HummingbirdTrochilidae62023-66%1990
Song SparrowPasserellidae62023-62%1990
Western TanagerCardinalidae62023+114%1990
Rock WrenTroglodytidae62023-30%1990
Western BluebirdTurdidae62021+11%1997
Steller's JayCorvidae52023+10%1992
European StarlingSturnidae52018-11%1992
Barn SwallowHirundinidae52021-50%1990
Pine SiskinFringillidae52023-19%1992
Common GrackleIcteridae52022+283%2009
House SparrowPasseridae52015n/an/a
MallardAnatidae42023+169%1991
Evening GrosbeakFringillidae42023+100%2018
Savannah SparrowPasserellidae42023+89%1990
Violet-green SwallowHirundinidae42023-90%1990
Mountain BluebirdTurdidae42023-70%1990
American CootRallidae42009+300%2007
Pinyon JayCorvidae42007n/an/a
White-throated SwiftApodidae42014n/an/a
Ring-billed GullLaridae42019n/an/a
Western Wood-PeweeTyrannidae32023-60%1990
Common RavenCorvidae32023-64%1990
Vesper SparrowPasserellidae32023-26%1991
Ruby-crowned KingletRegulidae32023-46%1990
Willow FlycatcherTyrannidae32005+200%1989
GadwallAnatidae32023-44%1993
Black-headed GrosbeakCardinalidae32023+100%2011
Turkey VultureCathartidae32021+200%2016
Red-naped SapsuckerPicidae22023-17%2000

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