BirdAnalyst
Species · South Dakota · BBS 2025 Release · 1966–2024

Yellow-billed Cuckoo Population Trend in South Dakota

All statesGeneralists

Yellow-billed Cuckoo in South Dakota has declined: down 36% on the route-weighted index since 1969.

-36%Since 1969TrendPercent 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 →
35Routes In StateSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
47YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Yellow-billed Cuckoo Trends in South DakotaNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

No notable trend signals for Yellow-billed Cuckoo in South Dakota. See the full index history below.

Yellow-billed Cuckoo Population Forecast in South Dakota

If the recent trend holds, Yellow-billed Cuckoo in South Dakota is projected to fall about 48% by 2028 — from 0.07 in 2023 to a central estimate of 0.04 (95% range 0.00–0.21). A 5-year backtest shows a typical error of ±52.9%, with 100% of held-out values landing inside the 95% band.

-48%Change by 2028TrendPercent 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 →
0.04Projected 2028 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.2195% range95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
±52.9%Backtest errorBacktest errorTypical error when we hold out the most recent years, forecast them, and compare to what actually happened. Lower means a more trustworthy projection.Full methodology →
If the recent trend holds, Yellow-billed Cuckoo in South Dakota is projected to fall about 48% by 2028 — from 0.07 in 2023 to a central estimate of 0.04 (95% range 0.00–0.21). A 5-year backtest shows a typical error of ±52.9%, with 100% of held-out values landing inside the 95% band.19672028
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →95% low95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →95% high95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
20240.040.000.22
20250.040.000.22
20260.040.000.22
20270.040.000.21
20280.040.000.21

Yellow-billed Cuckoo Survey Routes in South Dakota

Routes recording Yellow-billed Cuckoo in South Dakota.
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 →
Promise419991996
Lane 2220062006
Lennox120231968
Tripp119871967
Howard120181990
White Lake119701970
Geddes120171968
Chamberlain120111970
Winner120192006
Rosebud120101988
Rockyford119881987
Volga120061979
Roswell119941968
Broadland120081968
Lane119741968
Ft Thompson120111970
Wilmot120092009
Veblen120122012
Britton120002000
Gettysburg119711971
Laplant119751972
Owanka119901990
Volunteer119691968
Ottumwa120061972
Harding119991999

Yellow-billed Cuckoo Population Trend in Other States

alabamaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinatennesseetexasutahvermontvirginiawest-virginiawisconsinwyoming

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