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BBS Route · Idaho · BCR 10

Cape Horn Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 102 species recorded across 38 survey years, still active.

102Species 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 →
38Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1972–2024Span
3Observers

Bird Species Found on Idaho Cape Horn

Top 40 of 102 species by most recent count. Each links to its species trend.

Species recorded on the Cape Horn 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
American RobinTurdidae432024-15%1987
Cliff SwallowHirundinidae362024-60%1987
Sandhill CraneGruidae362024+307%1988
Warbling VireoVireonidae322024+154%1987
Lincoln's SparrowPasserellidae302024+76%1989
Red-winged BlackbirdIcteridae272024+533%1989
White-crowned SparrowPasserellidae252024+43%1987
American CrowCorvidae242021+800%1998
Western TanagerCardinalidae202024+444%1988
Chipping SparrowPasserellidae182024+107%1987
Ruby-crowned KingletRegulidae182024+221%1988
Dusky FlycatcherTyrannidae162024+220%1992
Vesper SparrowPasserellidae152024+122%1987
Western Wood-PeweeTyrannidae142024+100%1988
Swainson's ThrushTurdidae132024+45%1988
Pine SiskinFringillidae112024-51%1987
Olive-sided FlycatcherTyrannidae112024+289%1988
Song SparrowPasserellidae82024-29%1988
Willow FlycatcherTyrannidae82024+180%1989
Cassin's FinchFringillidae82024+180%1989
Yellow WarblerParulidae72024+140%1988
Brewer's SparrowPasserellidae72024+467%1989
Mountain ChickadeeParidae72024+58%1988
Brown-headed CowbirdIcteridae62024-58%1987
Brewer's BlackbirdIcteridae62024-37%1987
Savannah SparrowPasserellidae62024-27%1987
Canada GooseAnatidae62022+29%2011
Wilson's SnipeScolopacidae52024-39%1987
Red CrossbillFringillidae52023-71%1988
Northern Rough-winged SwallowHirundinidae51992n/an/a
Hammond's FlycatcherTyrannidae42024+0%1989
Common RavenCorvidae42024+0%1988
Tree SwallowHirundinidae42024+467%1994
Common MerganserAnatidae42018+133%2010
Western MeadowlarkIcteridae32024-56%1989
Townsend's SolitaireTurdidae32006+50%1990
Canada JayCorvidae32024+17%1992
Common YellowthroatParulidae32024+100%1998
Steller's JayCorvidae32005+200%2000
Violet-green SwallowHirundinidae32015+500%2011

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