BirdAnalyst
BBS Route · Iowa · BCR 11

Zearing Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 82 species recorded across 23 survey years, no longer active.

82Species 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 →
23Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1967–1995Span
7Observers

Bird Species Found on Iowa Zearing

Top 40 of 82 species by most recent count. Each links to its species trend.

Species recorded on the Zearing 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 BlackbirdIcteridae1351995-18%1970
Western MeadowlarkIcteridae621995-71%1970
House SparrowPasseridae571995-9%1970
Barn SwallowHirundinidae521995+258%1970
American RobinTurdidae521995+156%1970
Song SparrowPasserellidae48199513×1970
DickcisselCardinalidae461995-58%1970
Mourning DoveColumbidae451995+122%1970
European StarlingSturnidae451995-8%1970
Brown-headed CowbirdIcteridae431995+244%1970
KilldeerCharadriidae35199518×1970
American CrowCorvidae311995-24%1970
Horned LarkAlaudidae301995-10%1971
Common GrackleIcteridae251995-60%1970
Ring-necked PheasantPhasianidae221995-58%1970
American GoldfinchFringillidae201995+55%1971
Eastern KingbirdTyrannidae181995+81%1970
Common YellowthroatParulidae161995-49%1970
Northern House WrenTroglodytidae121995+26%1970
Chipping SparrowPasserellidae121995+121%1984
Baltimore OrioleIcteridae101995+100%1977
Grasshopper SparrowPasserellidae101995-47%1970
Indigo BuntingCardinalidae101995+317%1971
Brown ThrasherMimidae81995+167%1970
Red-headed WoodpeckerPicidae71995-13%1970
Rock PigeonColumbidae61995-20%1970
Blue JayCorvidae61995-14%1970
Northern CardinalCardinalidae51995+240%1970
Vesper SparrowPasserellidae51995-83%1971
Northern Rough-winged SwallowHirundinidae51995+57%1974
Gray PartridgePhasianidae41994+75%1985
Red-tailed HawkAccipitridae31995+40%1983
Gray CatbirdMimidae31995+75%1971
Eastern PhoebeTyrannidae31995-50%1983
Great Blue HeronArdeidae31995+75%1991
Turkey VultureCathartidae31995+200%1994
American KestrelFalconidae21993+233%1983
Warbling VireoVireonidae21995-14%1971
Belted KingfisherAlcedinidae21995+67%1976
Great Crested FlycatcherTyrannidae21995-14%1983

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