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BBS Route · California · BCR 32

Greenfield Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 114 species recorded across 43 survey years, still active.

114Species 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 →
43Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1973–2025Span
7Observers

Bird Species Found on California Greenfield

Top 40 of 114 species by most recent count. Each links to its species trend.

Species recorded on the Greenfield 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
House FinchFringillidae1472025+101%1975
Tricolored BlackbirdIcteridae1132024+324%2014
Brewer's BlackbirdIcteridae1102025-67%1975
European StarlingSturnidae1042025+184%1975
House SparrowPasseridae472025+136%1975
Common RavenCorvidae41202514×1984
Mourning DoveColumbidae402025-24%1975
California Scrub-JayCorvidae392025+68%1975
Cliff SwallowHirundinidae352025-52%1975
Spotted TowheePasserellidae322025+87%1975
California QuailOdontophoridae312025+66%1975
WrentitSylviidae272025+311%1975
Red-winged BlackbirdIcteridae262025+33%1976
Eurasian Collared-DoveColumbidae242025+35%2014
Yellow-billed MagpieCorvidae232025-9%1975
Violet-green SwallowHirundinidae202025+6%1975
American CrowCorvidae152025+39%1975
California TowheePasserellidae152025+17%1975
Ash-throated FlycatcherTyrannidae142025+720%1975
Song SparrowPasserellidae142025+67%1975
Barn SwallowHirundinidae132025+464%1976
Northern MockingbirdMimidae132025+117%1975
Bewick's WrenTroglodytidae132025+23%1976
Lawrence's GoldfinchFringillidae112025+32%1977
Rock PigeonColumbidae102025+75%1983
Western BluebirdTurdidae92025+67%1975
Horned LarkAlaudidae92025+77%1987
Oak TitmouseParidae82025+69%1978
Western MeadowlarkIcteridae72025-63%1975
Northern Rough-winged SwallowHirundinidae72025-77%1975
Rufous-crowned SparrowPasserellidae72025+700%1976
Red-tailed HawkAccipitridae62025+633%1976
Nuttall's WoodpeckerPicidae62025+43%1975
Lesser GoldfinchFringillidae62025-55%1975
American RobinTurdidae62025+100%1976
Black PhoebeTyrannidae62025+120%1978
Acorn WoodpeckerPicidae52025+175%1975
Lark SparrowPasserellidae52025-25%1976
California ThrasherMimidae52025+100%1975
Turkey VultureCathartidae42025+100%1981

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