BirdAnalyst
BBS Route · Montana · BCR 10

Glen Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 123 species recorded across 44 survey years, still active.

123Species 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 →
44Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1977–2024Span
4Observers

Bird Species Found on Montana Glen

Top 40 of 123 species by most recent count. Each links to its species trend.

Species recorded on the Glen 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
Plumbeous VireoVireonidae1501991n/an/a
European StarlingSturnidae662024+47%1979
Red-winged BlackbirdIcteridae622024+12%1979
Horned LarkAlaudidae412024-46%1979
Black-billed MagpieCorvidae392024+246%1979
House SparrowPasseridae322024+213%1981
American AvocetRecurvirostridae32201416×1993
Vesper SparrowPasserellidae292024-9%1979
Western MeadowlarkIcteridae232024-66%1979
Rock WrenTroglodytidae182024-3%1979
Savannah SparrowPasserellidae142024-33%1979
Eastern KingbirdTyrannidae132024+171%1979
Rock PigeonColumbidae132023+767%1985
Common RavenCorvidae13202411×1983
Wilson's SnipeScolopacidae122024-38%1979
Northern House WrenTroglodytidae122024+317%1979
Long-billed CurlewScolopacidae11202412×1979
Yellow WarblerParulidae102024-23%1979
Mourning DoveColumbidae92024-20%1979
Sandhill CraneGruidae82024+110%1980
American RobinTurdidae82024-39%1979
Clay-colored SparrowPasserellidae81980n/an/a
Western Wood-PeweeTyrannidae72024+300%1979
Common YellowthroatParulidae62024-52%1979
Cinnamon TealAnatidae52018+33%1985
KilldeerCharadriidae52024-71%1979
Brown-headed CowbirdIcteridae52024-19%1979
Lazuli BuntingCardinalidae52024+60%1981
House FinchFringillidae52017+100%2007
Northern Rough-winged SwallowHirundinidae42024-76%1979
Mountain BluebirdTurdidae42017+250%1980
MallardAnatidae42024+333%1983
American WigeonAnatidae42017+300%2005
Ring-necked PheasantPhasianidae32024+13%1980
Yellow-headed BlackbirdIcteridae32024-71%1979
Brewer's BlackbirdIcteridae32023-65%1979
Barn SwallowHirundinidae32024-73%1979
Bank SwallowHirundinidae32024-64%1980
Pine SiskinFringillidae32022-44%2003
Northern ShovelerAnatidae32017+50%2000

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