BirdAnalyst
BBS Route · California · BCR 33

Essex Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 31 species recorded across 8 survey years, still active.

31Species 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 →
8Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1988–1996Span
4Observers

Bird Species Found on California Essex

Top 31 of 31 species by most recent count. Each links to its species trend.

Species recorded on the Essex 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
Black-throated SparrowPasserellidae311996-24%1992
Cactus WrenTroglodytidae91996-7%1991
Horned LarkAlaudidae51996-21%1991
VerdinRemizidae51996-27%1989
Common RavenCorvidae51995-25%1991
House FinchFringillidae41992+300%1989
Gambel's QuailOdontophoridae31996+71%1992
Mourning DoveColumbidae31996-67%1992
Ash-throated FlycatcherTyrannidae31996-67%1991
Loggerhead ShrikeLaniidae31993-17%1991
Black-tailed GnatcatcherPolioptilidae31989n/an/a
Ladder-backed WoodpeckerPicidae21991+100%1988
Greater RoadrunnerCuculidae21994+50%1991
Western MeadowlarkIcteridae21995+100%1992
Turkey VultureCathartidae11994+0%1988
Red-tailed HawkAccipitridae11989+0%1988
Prairie FalconFalconidae11988n/an/a
White-throated SwiftApodidae11988n/an/a
Western KingbirdTyrannidae11996-67%1988
Say's PhoebeTyrannidae11996-50%1988
Brown-headed CowbirdIcteridae11988n/an/a
House SparrowPasseridae11993-67%1988
Bullock's OrioleIcteridae11996+0%1989
LeConte's ThrasherMimidae11996-56%1993
Scott's OrioleIcteridae11995+0%1991
European StarlingSturnidae11995+0%1992
Northern MockingbirdMimidae11996+0%1993
Cassin's KingbirdTyrannidae11994n/an/a
Hooded OrioleIcteridae11996n/an/a
PhainopeplaPtiliogonatidae11996n/an/a
Bewick's WrenTroglodytidae11996n/an/a

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