BirdAnalyst
Guild · Iowa · BBS 2025 Release · 1966–2024

Generalists In Iowa

All statesIowa

49 species in this guild. As a group they are -32% since 1969.

Guild Signals

No notable trend signals for generalists in Iowa. See the full index history below.

Forecast

If the recent trend holds, Generalists in Iowa is projected to fall about 17% by 2029 — from 12 in 2024 to a central estimate of 9.8 (95% range 7.4–12). A 5-year backtest shows a typical error of ±6.5%, with 100% of held-out values landing inside the 95% band.

-17%Change by 2029
9.8Projected 2029 index
7.4–1295% range
±6.5%Backtest error
19672029
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected index95% low95% high
2025108.013
2026107.813
2027107.713
202810.07.512
20299.87.412

Member Species In Iowa

Generalists species in Iowa.
Loggerhead ShrikeLaniidae-86%
Black-billed CuckooCuculidae-75%
Yellow-billed CuckooCuculidae-71%
House SparrowPasseridae-67%
American GoldfinchFringillidae-60%
Swamp SparrowPasserellidae-59%
Rock PigeonColumbidae-58%
Brown ThrasherMimidae-57%
Field SparrowPasserellidae-52%
Blue JayCorvidae-43%
Yellow-headed BlackbirdIcteridae-43%
Common GrackleIcteridae-42%
Great Horned OwlStrigidae-41%
Eastern Screech-OwlStrigidae-38%
American CrowCorvidae-37%
Baltimore OrioleIcteridae-25%
Belted KingfisherAlcedinidae-25%
Great-tailed GrackleIcteridae-24%
European StarlingSturnidae-15%
Mourning DoveColumbidae-7%
Northern MockingbirdMimidae+3%
Song SparrowPasserellidae+5%
Red-winged BlackbirdIcteridae+10%
Rose-breasted GrosbeakCardinalidae+12%
Northern HarrierAccipitridae+14%
Scarlet TanagerCardinalidae+17%
Summer TanagerCardinalidae+21%
Barred OwlStrigidae+65%
Indigo BuntingCardinalidae+79%
Gray PartridgePhasianidae+83%
Brown-headed CowbirdIcteridae+85%
Northern CardinalCardinalidae+99%
Eastern TowheePasserellidae+103%
American KestrelFalconidae+110%
Gray CatbirdMimidae+183%
Orchard OrioleIcteridae+189%
Red-tailed HawkAccipitridae+200%
Cooper's HawkAccipitridae+244%
House FinchFringillidae+265%
Bald EagleAccipitridae+306%
Blue GrosbeakCardinalidae+344%
Yellow-breasted ChatIcteriidae+377%
Ruby-throated HummingbirdTrochilidae+391%
Cedar WaxwingBombycillidae+644%
Chipping SparrowPasserellidae+645%
Wild TurkeyPhasianidae13×
Turkey VultureCathartidae14×
Eurasian Tree SparrowPasseridae14×
Eurasian Collared-DoveColumbidae51×

Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.