BirdAnalyst
Species · BCR 30 · BBS 2025 Release · 1966–2024

Yellow-billed Cuckoo In New England / Mid-Atlantic Coast

All regionsNew England / Mid-Atlantic CoastGeneralists

Yellow-billed Cuckoo in New England / Mid-Atlantic Coast has declined: down 26% on the route-weighted index since 1968.

-26%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 →
160Routes 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 →
58YearsYears 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 New England / Mid-Atlantic Coast. See the full index history below.

Yellow-billed Cuckoo In New England / Mid-Atlantic Coast Population Forecast

If the recent trend holds, Yellow-billed Cuckoo in New England / Mid-Atlantic Coast is projected to fall about 10% by 2029 — from 1.9 in 2024 to a central estimate of 1.7 (95% range 0.00–3.6). A 5-year backtest shows a typical error of ±27%, with 100% of held-out values landing inside the 95% band.

-10%Change 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 →
1.7Projected 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 →
0.00–3.695% 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 →
±27%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 New England / Mid-Atlantic Coast is projected to fall about 10% by 2029 — from 1.9 in 2024 to a central estimate of 1.7 (95% range 0.00–3.6). A 5-year backtest shows a typical error of ±27%, 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 →
20251.80.003.7
20261.80.003.7
20271.70.003.6
20281.70.003.6
20291.70.003.6

Routes In New England / Mid-Atlantic Coast

Routes recording Yellow-billed Cuckoo in New England / Mid-Atlantic Coast.
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 →
BrandonVIRGINIA192024
Pepperbox 2DELAWARE132024
BlackbirdDELAWARE112024
Milton 2DELAWARE112017
Spraguetown 2NEW-JERSEY112007
Lowes XrdsDELAWARE91991
Holleyville 2DELAWARE92019
Snow HillMARYLAND91976
PomonaNEW-JERSEY82023
WillimanticCONNECTICUT72018
HolleyvilleDELAWARE72004
WalnutMARYLAND72024
Del HavenNEW-JERSEY71991
MelitotaMARYLAND62024
CokesburyMARYLAND62024
SinepuxentMARYLAND61978
Casimir Pulaski SfRHODE-ISLAND62018
Port RoyalVIRGINIA62019
QuinbyVIRGINIA62024
Cape CharlesVIRGINIA62018
WoodstockCONNECTICUT52007
Warren 2CONNECTICUT52021
Pt RepublicMARYLAND51988
Tall TimbersMARYLAND52013
La PlataMARYLAND52009

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