BirdAnalyst
BBS Route · Colorado · BCR 16

Piedra Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 127 species recorded across 23 survey years, still active.

127Species 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 →
23Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1992–2024Span
5Observers

Bird Species Found on Colorado Piedra

Top 40 of 127 species by most recent count. Each links to its species trend.

Species recorded on the Piedra 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
Canada GooseAnatidae402024+115%2008
Western MeadowlarkIcteridae302024-54%1996
Brewer's SparrowPasserellidae301999n/an/a
Western Wood-PeweeTyrannidae212024-7%1996
Red-winged BlackbirdIcteridae202024-3%1996
Spotted TowheePasserellidae192024+50%1996
Vesper SparrowPasserellidae172024+32%1996
American CootRallidae152024-21%1996
American RobinTurdidae142024-51%1996
Brewer's BlackbirdIcteridae92024-77%1996
Northern House WrenTroglodytidae92024-54%1996
American CrowCorvidae82024-58%1996
Cliff SwallowHirundinidae72024-25%1996
Black SwiftApodidae72001n/an/a
Ring-necked DuckAnatidae62016+43%1999
Ruddy DuckAnatidae62023+30%1998
Lewis's WoodpeckerPicidae62024-53%1996
Field SparrowPasserellidae61997n/an/a
Pinyon JayCorvidae62012+500%2009
Horned LarkAlaudidae52024-29%1998
Chipping SparrowPasserellidae52024-40%1996
Barn SwallowHirundinidae52021-71%1997
Say's PhoebeTyrannidae42023+100%1996
Western TanagerCardinalidae42024-56%1996
Mountain BluebirdTurdidae42023-20%1996
Yellow-headed BlackbirdIcteridae42024-27%1997
House SparrowPasseridae42024+80%2002
Lesser GoldfinchFringillidae42007n/an/a
KilldeerCharadriidae32023-28%1996
Steller's JayCorvidae32024-86%1996
Common RavenCorvidae32024-50%1996
Brown-headed CowbirdIcteridae32024-61%1996
Pine SiskinFringillidae32024-89%1996
Black-headed GrosbeakCardinalidae32024-50%1997
Plumbeous VireoVireonidae32024-83%1996
MallardAnatidae32024-58%1999
Red CrossbillFringillidae32009-56%1997
Dusky FlycatcherTyrannidae32024-74%1998
Peregrine FalconFalconidae32007n/an/a
GadwallAnatidae22024+43%1999

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