BirdAnalyst
BBS Route · Montana · BCR 10

Boulder Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 101 species recorded across 51 survey years, still active.

101Species 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 →
51Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1969–2025Span
4Observers

Bird Species Found on Montana Boulder

Top 40 of 101 species by most recent count. Each links to its species trend.

Species recorded on the Boulder 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 StarlingSturnidae1172025+168%1971
Vesper SparrowPasserellidae1142025+25%1971
Western MeadowlarkIcteridae762025-28%1971
Mourning DoveColumbidae312025-60%1971
Brewer's SparrowPasserellidae312025-5%1971
Franklin's GullLaridae301993-56%1974
Red-winged BlackbirdIcteridae272025-10%1971
Long-billed CurlewScolopacidae262024+5%1971
House SparrowPasseridae222025+29%1971
Savannah SparrowPasserellidae182025-40%1971
American RobinTurdidae172025+411%1971
Brown-headed CowbirdIcteridae162025-12%1971
Brewer's BlackbirdIcteridae152025-56%1971
Common RavenCorvidae12202522×1979
Black-billed MagpieCorvidae112025-34%1971
Eurasian Collared-DoveColumbidae102025+53%2013
Mountain BluebirdTurdidae92025-4%1971
Rock PigeonColumbidae92025+275%1979
Ring-necked PheasantPhasianidae82025-30%1971
Dusky FlycatcherTyrannidae82025+460%1972
Horned LarkAlaudidae72025-86%1971
Ring-billed GullLaridae72022-45%2004
Cliff SwallowHirundinidae62021-85%1994
Red-tailed HawkAccipitridae62025+400%1975
Common GrackleIcteridae6202412×2004
Swainson's HawkAccipitridae62025-7%2022
Spotted TowheePasserellidae52025+100%1973
Barn SwallowHirundinidae52025-78%1971
Sage ThrasherMimidae52025-73%1971
Clark's NutcrackerCorvidae52025+50%1974
Hammond's FlycatcherTyrannidae51989+400%1976
Northern House WrenTroglodytidae52025+125%2001
Western KingbirdTyrannidae42025+320%1971
Northern Rough-winged SwallowHirundinidae42025-38%1971
Rock WrenTroglodytidae42025-64%1971
Eastern KingbirdTyrannidae42025+340%1972
Lark SparrowPasserellidae42025+40%1976
Pine SiskinFringillidae42024+50%1976
Warbling VireoVireonidae42024+20%1979
Evening GrosbeakFringillidae41978n/an/a

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