BirdAnalyst
BBS Route · Montana · BCR 10

Glen Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 124 species recorded across 45 survey years, still active.

124Species 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 →
45Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1977–2025Span
4Observers

Bird Species Found on Montana Glen

Top 40 of 124 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
European StarlingSturnidae1532025+49%1979
Plumbeous VireoVireonidae1501991n/an/a
Northern Rough-winged SwallowHirundinidae742025+76%1979
Horned LarkAlaudidae502025-29%1979
Cliff SwallowHirundinidae492025-29%1986
Western MeadowlarkIcteridae372025-50%1979
Brewer's BlackbirdIcteridae372025-48%1979
Black-billed MagpieCorvidae352025+234%1979
American AvocetRecurvirostridae32201416×1993
Vesper SparrowPasserellidae292025-12%1979
Red-winged BlackbirdIcteridae232025-11%1979
Long-billed CurlewScolopacidae20202514×1979
Eastern KingbirdTyrannidae152025+112%1979
Brown-headed CowbirdIcteridae132025+19%1979
Rock PigeonColumbidae132023+767%1985
Mourning DoveColumbidae122025-20%1979
Yellow-headed BlackbirdIcteridae112025-53%1979
Sandhill CraneGruidae92025+160%1980
Savannah SparrowPasserellidae92025-17%1979
American RobinTurdidae92025-43%1979
Yellow WarblerParulidae82025-19%1979
Clay-colored SparrowPasserellidae81980n/an/a
Northern House WrenTroglodytidae62025+317%1979
Common RavenCorvidae62025+225%1983
Golden EagleAccipitridae62025+125%2008
Cinnamon TealAnatidae52018+33%1985
Wilson's SnipeScolopacidae52025-49%1979
Red-tailed HawkAccipitridae52025+267%1979
House SparrowPasseridae52025+194%1981
Rock WrenTroglodytidae52025-9%1979
Mountain BluebirdTurdidae52025+300%1980
House FinchFringillidae52017+100%2007
Ring-necked PheasantPhasianidae42025+38%1980
Bullock's OrioleIcteridae42025-13%1979
Common YellowthroatParulidae42025-38%1979
MallardAnatidae42024+333%1983
Western KingbirdTyrannidae42025+60%2002
Ferruginous HawkAccipitridae42025+80%2006
American WigeonAnatidae42017+300%2005
KilldeerCharadriidae32025-76%1979

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