BirdAnalyst
BBS Route · Montana · BCR 11

Oswego Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 84 species recorded across 33 survey years, still active.

84Species 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 →
33Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1978–2024Span
10Observers

Bird Species Found on Montana Oswego

Top 40 of 84 species by most recent count. Each links to its species trend.

Species recorded on the Oswego 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 LarkAlaudidae2802024+65%1981
Mourning DoveColumbidae912024+280%1981
Western MeadowlarkIcteridae792024-5%1981
Chestnut-collared LongspurCalcariidae772024-7%1981
Brown-headed CowbirdIcteridae632024+153%1981
European StarlingSturnidae602009+475%1984
Red-winged BlackbirdIcteridae512024+52%1981
Vesper SparrowPasserellidae362024+136%1981
MallardAnatidae282024+750%1983
Rock PigeonColumbidae252024-10%2009
Grasshopper SparrowPasserellidae192024+186%1982
American White PelicanPelecanidae172006+240%2003
BobolinkIcteridae162024+315%2001
Brewer's BlackbirdIcteridae142024+20%1981
Thick-billed LongspurCalcariidae142024-3%1992
Lark BuntingPasserellidae142024-69%1981
Cliff SwallowHirundinidae142021n/an/a
Clay-colored SparrowPasserellidae112024+167%1981
Eastern KingbirdTyrannidae92024+29%1981
Western KingbirdTyrannidae92024+300%1981
Barn SwallowHirundinidae82024+33%1981
Wilson's SnipeScolopacidae72024+275%1984
Baird's SparrowPasserellidae72024-71%1981
Common GrackleIcteridae72024+50%1997
Marbled GodwitScolopacidae62024+138%1981
Common NighthawkCaprimulgidae62023+183%1982
Loggerhead ShrikeLaniidae62024+56%1981
Sprague's PipitMotacillidae62024-12%1981
American CootRallidae52021+11%1983
Savannah SparrowPasserellidae52024-67%1982
American RobinTurdidae52024+150%1989
Ring-billed GullLaridae52021+133%2000
Canada GooseAnatidae52021-83%2015
Northern PintailAnatidae42019+0%1996
KilldeerCharadriidae42024-70%1981
Brewer's SparrowPasserellidae42001+0%1981
Ring-necked PheasantPhasianidae42024-16%1983
Bank SwallowHirundinidae42022-19%1998
GadwallAnatidae32023+0%2002
RedheadAnatidae31978n/an/a

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