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Species · BCR 12 · BBS 2026 Release · 1966–2025

Yellow-billed Cuckoo In Boreal Hardwood Transition

All regionsBoreal Hardwood TransitionForest birds

Yellow-billed Cuckoo in Boreal Hardwood Transition has declined: down 30% on the route-weighted index since 1968.

-30%Since 1968TrendPercent 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 →
85Routes In RegionSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
59YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable SignalsNotable 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 Boreal Hardwood Transition. See the full index history below.

Yellow-billed Cuckoo In Boreal Hardwood Transition Population Forecast

If the recent trend holds, Yellow-billed Cuckoo in Boreal Hardwood Transition is projected to stay roughly flat through 2030, near 0.07 (95% range 0.00–0.44). A 5-year backtest shows a typical error of ±58.8%, with 100% of held-out values landing inside the 95% band.

+7%Change by 2030TrendPercent 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 →
0.07Projected 2030 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.4495% 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 →
±58.8%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 Boreal Hardwood Transition is projected to stay roughly flat through 2030, near 0.07 (95% range 0.00–0.44). A 5-year backtest shows a typical error of ±58.8%, with 100% of held-out values landing inside the 95% band.19662030
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 →
20260.100.000.47
20270.090.000.46
20280.080.000.46
20290.080.000.45
20300.070.000.44

Routes In Boreal Hardwood Transition

Routes recording Yellow-billed Cuckoo in Boreal Hardwood Transition.
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 →
CreightonMICHIGAN91980
BayfieldWISCONSIN72023
Little ForkMINNESOTA61969
WaskishMINNESOTA51982
Amnicon FallsWISCONSIN52000
RiggsvilleMICHIGAN42017
MayfieldMICHIGAN42014
Land O LakesWISCONSIN42006
CrandonWISCONSIN41980
Weirgor SpringsWISCONSIN42024
Pleasant ValMICHIGAN31991
CathroMICHIGAN32009
SidnawMICHIGAN32024
MareniscoMICHIGAN21998
Maple GroveMICHIGAN22023
CunardMICHIGAN22015
Red OakMICHIGAN22022
BemidjiMINNESOTA21980
LudeMINNESOTA21998
Red LakeMINNESOTA21993
WarroadMINNESOTA22003
Popple RiverWISCONSIN21988
Washington IWISCONSIN22022
MellenWISCONSIN22015
RhinelanderWISCONSIN21998

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.