BirdAnalyst
Species · BCR 24 · BBS 2025 Release · 1966–2024

Black-billed Cuckoo In Central Hardwoods

All regionsCentral HardwoodsGeneralists

Black-billed Cuckoo in Central Hardwoods has declined: down 46% on the route-weighted index since 1968.

-46%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 →
60Routes 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 →
54YearsYears 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 Black-billed Cuckoo in Central Hardwoods. See the full index history below.

Black-billed Cuckoo In Central Hardwoods Population Forecast

If the recent trend holds, Black-billed Cuckoo in Central Hardwoods is projected to stay roughly flat through 2029, near 0.00 (95% range 0.00–0.14). A 5-year backtest shows a typical error of ±168%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2029TrendPercent 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 →
0.00Projected 2029 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.1495% 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 →
±168%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, Black-billed Cuckoo in Central Hardwoods is projected to stay roughly flat through 2029, near 0.00 (95% range 0.00–0.14). A 5-year backtest shows a typical error of ±168%, with 100% of held-out values landing inside the 95% band.19662029
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 →
20250.000.000.14
20260.000.000.14
20270.000.000.14
20280.000.000.14
20290.000.000.14

Routes In Central Hardwoods

Routes recording Black-billed Cuckoo in Central Hardwoods.
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 →
ClementineMISSOURI41986
MarshfieldMISSOURI32022
SpencerINDIANA22009
CumbackINDIANA21983
MillersburgINDIANA21981
DixonKENTUCKY22007
BarksMISSOURI21995
BlandMISSOURI22013
RomeOHIO21997
GlenTENNESSEE21972
RudyARKANSAS12012
BirdsILLINOIS11992
BremenILLINOIS11996
DelwoodILLINOIS11986
YorkILLINOIS12003
PimentoINDIANA11996
BrazilINDIANA12003
BelmontINDIANA12017
AzaliaINDIANA11989
Indian SpgsINDIANA12022
CelestineINDIANA12021
Clear SpringINDIANA11994
New PhilaINDIANA11984
CorydonINDIANA12000
VevayINDIANA11997

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