BirdAnalyst
BBS Route · California · BCR 32

Foster Park Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 109 species recorded across 25 survey years, no longer active.

109Species 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 →
1968–1994Span
4Observers

Bird Species Found on California Foster Park

Top 40 of 109 species by most recent count. Each links to its species trend.

Species recorded on the Foster Park 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 FinchFringillidae601994-28%1970
BushtitAegithalidae521994-18%1970
Cliff SwallowHirundinidae421994-45%1970
European StarlingSturnidae33199419×1970
California TowheePasserellidae291994+31%1970
WrentitSylviidae271994+38%1970
California Scrub-JayCorvidae251994+114%1970
Mourning DoveColumbidae201994+47%1970
Lesser GoldfinchFringillidae201994+11%1970
Spotted TowheePasserellidae161994-57%1970
Northern MockingbirdMimidae161994+144%1970
House SparrowPasseridae161994-5%1973
Red-winged BlackbirdIcteridae151994+229%1972
Costa's HummingbirdTrochilidae141993+433%1975
Black-headed GrosbeakCardinalidae141994-39%1970
American CrowCorvidae131994-7%1970
Northern House WrenTroglodytidae131994+53%1970
Lawrence's GoldfinchFringillidae111985-35%1977
Ash-throated FlycatcherTyrannidae111994+105%1971
Acorn WoodpeckerPicidae91994+166%1970
Oak TitmouseParidae71994-25%1970
Steller's JayCorvidae71994+250%1975
Song SparrowPasserellidae51994+244%1970
Northern Rough-winged SwallowHirundinidae51994+0%1970
PhainopeplaPtiliogonatidae51994+111%1970
Yellow WarblerParulidae51994+138%1977
California ThrasherMimidae51994+0%1971
Lazuli BuntingCardinalidae51994+240%1975
Common YellowthroatParulidae51994+88%1981
Ruddy DuckAnatidae51975n/an/a
American CootRallidae41994+67%1974
Hooded OrioleIcteridae41994+111%1970
Bullock's OrioleIcteridae41994+179%1970
Cassin's KingbirdTyrannidae41981+333%1973
Red-tailed HawkAccipitridae31994+75%1970
Nuttall's WoodpeckerPicidae31994+150%1971
Western MeadowlarkIcteridae31993-81%1970
Bewick's WrenTroglodytidae31994-26%1970
Western BluebirdTurdidae31994+22%1973
Western KingbirdTyrannidae31994+200%1975

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