BirdAnalyst
BBS Route · Washington · BCR 9

Mercer Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 62 species recorded across 49 survey years, still active.

62Species 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 →
49Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1968–2022Span
5Observers

Bird Species Found on Washington Mercer

Top 40 of 62 species by most recent count. Each links to its species trend.

Species recorded on the Mercer 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
Western MeadowlarkIcteridae872022+494%1970
Horned LarkAlaudidae492022-85%1970
California GullLaridae491985+29%1977
Canada GooseAnatidae352019-40%2003
Cliff SwallowHirundinidae162021+380%1995
Red-winged BlackbirdIcteridae15202213×1976
Bank SwallowHirundinidae15200615×1972
Barn SwallowHirundinidae132022+115%1971
Western KingbirdTyrannidae132022+210%1985
Common RavenCorvidae122022+313%1982
Mourning DoveColumbidae112022+800%1972
Brewer's BlackbirdIcteridae112022+550%1976
Brown-headed CowbirdIcteridae92022+67%1990
House SparrowPasseridae72022-33%1974
Common NighthawkCaprimulgidae62019+750%1987
American RobinTurdidae52022+200%1988
KilldeerCharadriidae42022+9%1972
ChukarPhasianidae41976-20%1968
Ring-necked PheasantPhasianidae42022+175%1970
Red-tailed HawkAccipitridae42022+117%1976
Savannah SparrowPasserellidae42003-40%1991
House FinchFringillidae42022+63%1993
Eurasian Collared-DoveColumbidae42022+92%2012
American GoldfinchFringillidae32009+20%1997
Double-crested CormorantPhalacrocoracidae32003-40%1998
California QuailOdontophoridae22022-56%1974
Northern Rough-winged SwallowHirundinidae22010-17%1985
Eastern KingbirdTyrannidae21970n/an/a
Grasshopper SparrowPasserellidae22018-46%1993
Long-billed CurlewScolopacidae22016+175%1991
Lark SparrowPasserellidae22022+150%1993
American Barn OwlTytonidae22015n/an/a
Yellow-headed BlackbirdIcteridae22021n/an/a
Ring-billed GullLaridae12002-95%1972
Prairie FalconFalconidae12017-20%1982
Black-billed MagpieCorvidae12019-50%1971
American CrowCorvidae12022-90%1970
European StarlingSturnidae12022-77%1972
Loggerhead ShrikeLaniidae12022-65%1970
Northern HarrierAccipitridae12022-64%1971

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