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BBS Route · California · BCR 32

Collegeville Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 79 species recorded across 25 survey years, no longer active.

79Species 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 →
25Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1968–2004Span
6Observers

Bird Species Found on California Collegeville

Top 40 of 79 species by most recent count. Each links to its species trend.

Species recorded on the Collegeville 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 BlackbirdIcteridae1002004+158%1970
Brewer's BlackbirdIcteridae932004-70%1970
Cliff SwallowHirundinidae672004+147%1970
House SparrowPasseridae672004-9%1970
American CrowCorvidae57200412×1974
Yellow-billed MagpieCorvidae462004+605%1970
Northern Rough-winged SwallowHirundinidae322002+240%1979
European StarlingSturnidae302004+68%1970
House FinchFringillidae302004-27%1970
Northern MockingbirdMimidae282004-4%1970
Brown-headed CowbirdIcteridae20200412×1975
KilldeerCharadriidae142004-58%1972
Western MeadowlarkIcteridae142001-78%1970
Mourning DoveColumbidae132004-15%1970
Western KingbirdTyrannidae122004+56%1970
Rock PigeonColumbidae92004+9%1970
Ruddy DuckAnatidae91987n/an/a
California Scrub-JayCorvidae82004+86%1970
American RobinTurdidae82004+5%1970
American CootRallidae81987+700%1972
Common RavenCorvidae81978n/an/a
Forster's TernLaridae81987n/an/a
Barn SwallowHirundinidae72004-46%1970
Northern HarrierAccipitridae52004-10%1972
Song SparrowPasserellidae52004+0%1973
Spotted TowheePasserellidae51998+125%1973
Ring-billed GullLaridae51979n/an/a
Tree SwallowHirundinidae51987+400%1985
Northern House WrenTroglodytidae42001+67%1996
California QuailOdontophoridae32001-17%1970
Ring-necked PheasantPhasianidae32004-81%1970
American KestrelFalconidae32004-78%1970
Savannah SparrowPasserellidae31972n/an/a
MallardAnatidae32004-53%1980
Northern PintailAnatidae31985-73%1978
Black-necked StiltRecurvirostridae32000-69%1985
American AvocetRecurvirostridae31985n/an/a
Burrowing OwlStrigidae22004+0%1970
Acorn WoodpeckerPicidae21972-50%1969
Loggerhead ShrikeLaniidae22002-85%1970

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