BirdAnalyst
Species · BCR 14 · BBS 2025 Release · 1966–2024

Yellow-billed Cuckoo In Atlantic Northern Forest

All regionsAtlantic Northern ForestGeneralists

Yellow-billed Cuckoo in Atlantic Northern Forest has surged: up 307% on the route-weighted index since 1969.

+307%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 →
57Routes 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 →
53YearsYears 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 →

long arc increasecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Yellow-billed Cuckoo has surged in Atlantic Northern Forest: up 307% on the route-weighted index since 1969.

Yellow-billed Cuckoo In Atlantic Northern Forest Population Forecast

If the recent trend holds, Yellow-billed Cuckoo in Atlantic Northern Forest is projected to stay roughly flat through 2029, near 0.11 (95% range 0.00–0.24). A 5-year backtest shows a typical error of ±50%, with 60% 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 →
0.11Projected 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 →
0.00–0.2495% 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 →
±50%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 Atlantic Northern Forest is projected to stay roughly flat through 2029, near 0.11 (95% range 0.00–0.24). A 5-year backtest shows a typical error of ±50%, with 60% 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 →
20250.100.000.23
20260.100.000.23
20270.110.000.23
20280.110.000.23
20290.110.000.24

Routes In Atlantic Northern Forest

Routes recording Yellow-billed Cuckoo in Atlantic Northern Forest.
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 →
TurnerMAINE71997
HopkintonNEW-HAMPSHIRE52022
St Regis FlsNEW-YORK52009
S ReadingVERMONT42006
HartfordMAINE32022
New HartfordCONNECTICUT21981
EastbrookMAINE22019
NorthfieldMAINE21981
ChesterfieldMASSACHUSETTS22019
Jefferson HlNEW-HAMPSHIRE22022
WarrensburgNEW-YORK22006
New HartfordCONNECTICUT12022
WestbrookMAINE12014
BiddefordMAINE11990
South ArmMAINE12014
Bowdoin CtrMAINE12011
East TroyMAINE12019
HancockMAINE11999
Carrying PlMAINE12003
GreenvilleMAINE11997
BenedictaMAINE11979
RomeMAINE11996
SearsportMAINE12011
Brownfield 2MAINE12015
N OrangeMASSACHUSETTS12022

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