BirdAnalyst
BBS Route · Colorado · BCR 16

Tarryall Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 119 species recorded across 29 survey years, still active.

119Species 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 →
1988–2025Span
5Observers

Bird Species Found on Colorado Tarryall

Top 40 of 119 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
Red-winged BlackbirdIcteridae812025-50%1990
Violet-green SwallowHirundinidae602025-80%1990
American RobinTurdidae512025-36%1990
Barn SwallowHirundinidae432025+92%1990
Canada GooseAnatidae412025+183%1990
Western Wood-PeweeTyrannidae342025+7%1990
American White PelicanPelecanidae32202513×2008
Broad-tailed HummingbirdTrochilidae282025-9%1990
Green-tailed TowheePasserellidae252025-57%1990
Brown-headed CowbirdIcteridae192025+45%1990
Mountain ChickadeeParidae182025+225%1990
Yellow WarblerParulidae172025+127%1990
Northern House WrenTroglodytidae172025-66%1990
MallardAnatidae142025+163%1991
Western MeadowlarkIcteridae142025-55%1990
Western TanagerCardinalidae142025+257%1990
Warbling VireoVireonidae142025-34%1990
American CrowCorvidae122025+150%1990
Brewer's BlackbirdIcteridae112023+0%1990
Tree SwallowHirundinidae92025+53%1992
Chipping SparrowPasserellidae82025-50%1991
Mountain BluebirdTurdidae82025-65%1990
Western BluebirdTurdidae82025+89%1997
Song SparrowPasserellidae72025-66%1990
Cliff SwallowHirundinidae72025-74%1990
Vesper SparrowPasserellidae62025-42%1991
Black-headed GrosbeakCardinalidae62025+267%2011
Steller's JayCorvidae52025+30%1992
European StarlingSturnidae52018-11%1992
House SparrowPasseridae52015n/an/a
Black-billed MagpieCorvidae42025+85%1990
Common RavenCorvidae42025-75%1990
White-breasted NuthatchSittidae42025+20%1995
Pine SiskinFringillidae42025-19%1992
MacGillivray's WarblerParulidae42025+267%2005
American CootRallidae42009+300%2007
Pinyon JayCorvidae42007n/an/a
Lesser GoldfinchFringillidae42025+0%2016
White-throated SwiftApodidae42014n/an/a
Ring-billed GullLaridae42019n/an/a

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