BirdAnalyst
BBS Route · Montana · BCR 11

Glasgow Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 113 species recorded across 39 survey years, still active.

113Species 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 →
39Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1968–2025Span
10Observers

Bird Species Found on Montana Glasgow

Top 40 of 113 species by most recent count. Each links to its species trend.

Species recorded on the Glasgow 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
Horned LarkAlaudidae4142025+121%1970
Western MeadowlarkIcteridae2032025-28%1970
Mourning DoveColumbidae1052025+57%1970
Lark BuntingPasserellidae1042025-45%1970
Brown-headed CowbirdIcteridae682025+783%1970
Cliff SwallowHirundinidae592025+958%1981
Red-winged BlackbirdIcteridae542025+108%1970
Canada GooseAnatidae442025+242%2013
Rock PigeonColumbidae37202539×1989
Common GrackleIcteridae352025+176%1979
Ring-necked PheasantPhasianidae322025-27%1970
Barn SwallowHirundinidae302025+406%1970
Vesper SparrowPasserellidae202025+150%1970
House SparrowPasseridae162025+132%1970
Marbled GodwitScolopacidae152025+250%2001
Chestnut-collared LongspurCalcariidae142024-40%1970
American RobinTurdidae142025+217%1979
Eastern KingbirdTyrannidae132025+178%1970
Lark SparrowPasserellidae122025+363%1970
Brewer's BlackbirdIcteridae112025+19%1970
American GoldfinchFringillidae112025+333%1980
Loggerhead ShrikeLaniidae102025+375%1970
Western KingbirdTyrannidae102025+183%1981
BobolinkIcteridae102024+131%2006
Yellow WarblerParulidae92025+118%1970
Northern ShovelerAnatidae81982+100%1972
American AvocetRecurvirostridae81982n/an/a
Eurasian Collared-DoveColumbidae72025+157%2022
Gray PartridgePhasianidae62025+63%1970
Sharp-tailed GrousePhasianidae62021+167%1994
Common YellowthroatParulidae62016+50%1979
Ring-billed GullLaridae6202552×1980
KilldeerCharadriidae52025-24%1970
Black-billed MagpieCorvidae52025-71%1970
Green-winged TealAnatidae51982-50%1979
Bank SwallowHirundinidae52019-58%1980
House FinchFringillidae52025+67%2000
Wilson's SnipeScolopacidae52007+200%2002
American KestrelFalconidae42025+29%1972
European StarlingSturnidae42025+64%1970

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