BirdAnalyst
BBS Route · Colorado · BCR 16

Piedra Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 128 species recorded across 24 survey years, still active.

128Species 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 →
24Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1992–2025Span
5Observers

Bird Species Found on Colorado Piedra

Top 40 of 128 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
Brewer's SparrowPasserellidae301999n/an/a
MallardAnatidae202025+32%1999
Cliff SwallowHirundinidae152025-52%1996
Brewer's BlackbirdIcteridae142025-77%1996
Mourning DoveColumbidae122025-48%1996
Red-winged BlackbirdIcteridae122025-18%1996
Warbling VireoVireonidae122025-62%1996
Western Wood-PeweeTyrannidae102025+2%1996
Western MeadowlarkIcteridae102025-62%1996
Vesper SparrowPasserellidae102025+48%1996
American RobinTurdidae102025-69%1996
American CootRallidae92025-16%1996
Black-billed MagpieCorvidae92025-42%1996
Common RavenCorvidae92025-25%1996
Spotted TowheePasserellidae92025+36%1996
Pygmy NuthatchSittidae92025+33%1998
Turkey VultureCathartidae82025+120%2001
Northern House WrenTroglodytidae82025-51%1996
Canada GooseAnatidae82025+128%2008
Brown-headed CowbirdIcteridae72025-45%1996
Green-tailed TowheePasserellidae72025-59%1996
Western TanagerCardinalidae72025-64%1996
Black SwiftApodidae72001n/an/a
Ring-necked DuckAnatidae62025+114%1999
Ruddy DuckAnatidae62023+30%1998
American CrowCorvidae62025-81%1996
Field SparrowPasserellidae61997n/an/a
Cinnamon TealAnatidae62025-58%2002
Pinyon JayCorvidae62012+500%2009
Horned LarkAlaudidae52024-29%1998
Black-headed GrosbeakCardinalidae52025-10%1997
Dusky FlycatcherTyrannidae52025-68%1998
Lewis's WoodpeckerPicidae42025-37%1996
Steller's JayCorvidae42025-83%1996
White-breasted NuthatchSittidae42025-59%1996
Mountain BluebirdTurdidae42023-20%1996
Lesser GoldfinchFringillidae42007n/an/a
Say's PhoebeTyrannidae32025+125%1996
Chipping SparrowPasserellidae32025-51%1996
Yellow-headed BlackbirdIcteridae32025-41%1997

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