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BBS Route · California · BCR 32

Collegeville 2 Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 51 species recorded across 5 survey years, still active.

51Species 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 →
5Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
2007–2023Span
3Observers

Bird Species Found on California Collegeville 2

Top 40 of 51 species by most recent count. Each links to its species trend.

Species recorded on the Collegeville 2 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 BlackbirdIcteridae2652023+66%2009
Brewer's BlackbirdIcteridae1902023-21%2009
House FinchFringillidae1082023+12%2009
European StarlingSturnidae1042023+28%2009
American RobinTurdidae552023+757%2009
House SparrowPasseridae542023+6%2009
Mourning DoveColumbidae482023+70%2009
Swainson's HawkAccipitridae422023+76%2009
Cliff SwallowHirundinidae412023-51%2009
Eurasian Collared-DoveColumbidae362023n/an/a
Barn SwallowHirundinidae342023+42%2009
American GoldfinchFringillidae312023+417%2007
Northern MockingbirdMimidae202023-10%2009
American CrowCorvidae192023-67%2009
Western KingbirdTyrannidae182023+217%2009
Brown-headed CowbirdIcteridae182023-20%2009
Turkey VultureCathartidae152014+88%2013
Yellow-billed MagpieCorvidae132023-57%2009
California Scrub-JayCorvidae132023+189%2009
Black PhoebeTyrannidae122023+333%2009
Great EgretArdeidae112023+50%2009
Red-tailed HawkAccipitridae112023+113%2009
MallardAnatidae102023+233%2009
Canada GooseAnatidae102014+150%2013
Horned LarkAlaudidae92023n/an/a
Rock PigeonColumbidae82023+121%2009
Common RavenCorvidae82023n/an/a
KilldeerCharadriidae72023+0%2009
Great Blue HeronArdeidae62023-50%2009
Spotted TowheePasserellidae62023+500%2007
Song SparrowPasserellidae62023n/an/a
Nuttall's WoodpeckerPicidae52023n/an/a
Red-shouldered HawkAccipitridae42014+300%2009
Lesser GoldfinchFringillidae42023n/an/a
Ring-necked PheasantPhasianidae32009+200%2007
Northern Rough-winged SwallowHirundinidae32023-40%2007
Anna's HummingbirdTrochilidae32023-86%2013
California QuailOdontophoridae22023+33%2009
Green HeronArdeidae22009n/an/a
Western MeadowlarkIcteridae22023-67%2013

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