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BBS Route · Montana · BCR 11

Harlem Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 105 species recorded across 44 survey years, still active.

105Species 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 →
1968–2021Span
11Observers

Bird Species Found on Montana Harlem

Top 40 of 105 species by most recent count. Each links to its species trend.

Species recorded on the Harlem 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
Red-winged BlackbirdIcteridae2612021+59%1971
European StarlingSturnidae2082021+315%1981
Horned LarkAlaudidae1622021+32%1971
Cliff SwallowHirundinidae772021+204%1972
Western MeadowlarkIcteridae722021+32%1971
House SparrowPasseridae592021+98%1971
Common GrackleIcteridae45202111×1971
Brewer's BlackbirdIcteridae362021+537%1971
Barn SwallowHirundinidae282021+163%1971
Lark BuntingPasserellidae272021-68%1971
Brown-headed CowbirdIcteridae272021+627%1974
American White PelicanPelecanidae252017+525%1998
Thick-billed LongspurCalcariidae202021+875%1984
Franklin's GullLaridae182017+880%1996
KilldeerCharadriidae182021-7%1971
Mourning DoveColumbidae162021+117%1971
American RobinTurdidae162021+425%1972
Chestnut-collared LongspurCalcariidae152021+72%1971
Common NighthawkCaprimulgidae142018+50%1972
Wilson's SnipeScolopacidae122021+79%1984
Upland SandpiperScolopacidae102021+50%1980
American GoldfinchFringillidae102021+129%1989
Vesper SparrowPasserellidae92021+29%1971
Ring-billed GullLaridae92021-27%1982
Eurasian Collared-DoveColumbidae92021+275%2009
Brewer's SparrowPasserellidae82021-10%1972
Wilson's PhalaropeScolopacidae72021-70%1981
Eastern KingbirdTyrannidae72021+44%1971
BobolinkIcteridae72021-45%1982
Black-billed MagpieCorvidae62021-39%1971
Yellow WarblerParulidae62021+140%1981
Swainson's HawkAccipitridae62021+80%1983
Clay-colored SparrowPasserellidae52021+0%1982
Savannah SparrowPasserellidae42021-31%1982
Chimney SwiftApodidae42021+180%2010
Northern ShovelerAnatidae42011+25%1995
Short-eared OwlStrigidae42017+100%2004
Double-crested CormorantPhalacrocoracidae42001+300%1991
RedheadAnatidae41993n/an/a
American CrowCorvidae42009n/an/a

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