BirdAnalyst
BBS Route · Montana · BCR 11

Oswego Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 84 species recorded across 34 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 →
34Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1978–2025Span
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 LarkAlaudidae3442025+74%1981
Mourning DoveColumbidae1202025+364%1981
Lark BuntingPasserellidae872025-57%1981
Red-winged BlackbirdIcteridae752025+62%1981
Chestnut-collared LongspurCalcariidae712025-9%1981
Western MeadowlarkIcteridae692025-6%1981
European StarlingSturnidae602009+475%1984
Brown-headed CowbirdIcteridae492025+125%1981
Vesper SparrowPasserellidae342025+158%1981
MallardAnatidae282024+750%1983
Rock PigeonColumbidae222025+30%2009
American White PelicanPelecanidae172006+240%2003
BobolinkIcteridae142025+300%2001
Grasshopper SparrowPasserellidae142025+171%1982
Cliff SwallowHirundinidae142021n/an/a
Eastern KingbirdTyrannidae102025+57%1981
Brewer's BlackbirdIcteridae102025+44%1981
Thick-billed LongspurCalcariidae102025-5%1992
Savannah SparrowPasserellidae82025-58%1982
Marbled GodwitScolopacidae72025+150%1981
Clay-colored SparrowPasserellidae72025+167%1981
KilldeerCharadriidae62025-61%1981
Common NighthawkCaprimulgidae62023+183%1982
Western KingbirdTyrannidae62025+317%1981
Ring-necked PheasantPhasianidae62025-11%1983
American CootRallidae52021+11%1983
Ring-billed GullLaridae52021+133%2000
Canada GooseAnatidae52021-83%2015
Northern PintailAnatidae42019+0%1996
Brewer's SparrowPasserellidae42001+0%1981
Sprague's PipitMotacillidae42025+6%1981
GadwallAnatidae32023+0%2002
RedheadAnatidae31978n/an/a
Long-billed CurlewScolopacidae32024-18%2006
Gray PartridgePhasianidae32023+125%1981
Northern HarrierAccipitridae32024-59%1981
Baird's SparrowPasserellidae32025-73%1981
Common GrackleIcteridae32025+10%1997
Spotted SandpiperScolopacidae32025+100%2007
Pied-billed GrebePodicipedidae21997-67%1978

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