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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 39 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 →
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 →
1972–2025Span
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 RobinTurdidae592025-4%1987
Cliff SwallowHirundinidae462025-57%1987
Sandhill CraneGruidae422025+315%1988
Warbling VireoVireonidae312025+160%1987
Lincoln's SparrowPasserellidae252025+62%1989
White-crowned SparrowPasserellidae242025+55%1987
American CrowCorvidae242021+800%1998
Ruby-crowned KingletRegulidae192025+216%1988
Chipping SparrowPasserellidae172025+141%1987
Western TanagerCardinalidae172025+522%1988
Red-winged BlackbirdIcteridae162025+544%1989
Olive-sided FlycatcherTyrannidae162025+378%1988
Western Wood-PeweeTyrannidae162025+132%1988
Swainson's ThrushTurdidae162025+55%1988
Vesper SparrowPasserellidae142025+150%1987
Dusky FlycatcherTyrannidae122025+200%1992
Wilson's SnipeScolopacidae102025-37%1987
Brewer's BlackbirdIcteridae82025-55%1987
Yellow WarblerParulidae82025+150%1988
Common RavenCorvidae82025+46%1988
Brown-headed CowbirdIcteridae72025-55%1987
Savannah SparrowPasserellidae72025-17%1987
Song SparrowPasserellidae72025-25%1988
Mountain BluebirdTurdidae72025-10%1987
Brewer's SparrowPasserellidae72025+467%1989
Tree SwallowHirundinidae72025+500%1994
Willow FlycatcherTyrannidae62025+220%1989
Cassin's FinchFringillidae62025+80%1989
Canada GooseAnatidae62022+29%2011
Northern Rough-winged SwallowHirundinidae51992n/an/a
Spotted SandpiperScolopacidae42025-27%1987
Mourning DoveColumbidae42025+14%1987
Hammond's FlycatcherTyrannidae42025+0%1989
Common MerganserAnatidae42018+133%2010
Pine SiskinFringillidae32025-63%1987
Red CrossbillFringillidae32025-66%1988
Rock WrenTroglodytidae32025+50%1999
Townsend's SolitaireTurdidae32006+50%1990
Canada JayCorvidae32024+17%1992
Steller's JayCorvidae32005+200%2000

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