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

Black-billed Cuckoo In Atlantic Northern Forest

All regions Atlantic Northern Forest Generalists

Black-billed Cuckoo in Atlantic Northern Forest has collapsed: down 76% on the route-weighted index since 1968.

-76%Since 1968

129Routes In Region

58Years

Notable Signals

long arc declinecomputed index

Black-billed Cuckoo has collapsed in Atlantic Northern Forest: down 76% on the route-weighted index since 1968.

Forecast

If the recent trend holds, Black-billed Cuckoo in Atlantic Northern Forest is projected to fall about 100% by 2029 — from 0.14 in 2024 to a central estimate of 0.00 (95% range 0.00–0.55). A 5-year backtest shows a typical error of ±92.4%, with 100% of held-out values landing inside the 95% band.

-100%Change by 2029

0.00Projected 2029 index

0.00–0.5595% range

±92.4%Backtest error

Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.

Year	Projected index	95% low	95% high
2025	0.00	0.00	0.55
2026	0.00	0.00	0.55
2027	0.00	0.00	0.55
2028	0.00	0.00	0.55
2029	0.00	0.00	0.55

Routes In Atlantic Northern Forest

Routes recording Black-billed Cuckoo in Atlantic Northern Forest.

Speculator	NEW-YORK	5	1973
Eastbrook	MAINE	4	1987
Waite	MAINE	4	1977
Benton	MAINE	3	1980
Deblois	MAINE	3	2007
Wytopitlock	MAINE	3	1979
Highmarket	NEW-YORK	3	2006
Sciota	NEW-YORK	3	1978
New Hartford	CONNECTICUT	2	2019
Biddeford	MAINE	2	2004
Turner	MAINE	2	2002
Warren	MAINE	2	1988
Cooper	MAINE	2	2004
Charleston	MAINE	2	1995
Medway	MAINE	2	1979
Ludlow	MAINE	2	1995
Washburn	MAINE	2	1996
Heron Lake	MAINE	2	1994
Chesterfield	MASSACHUSETTS	2	2018
Peterborough	NEW-HAMPSHIRE	2	1996
Kasoag	NEW-YORK	2	2015
Blue Ridge S	NEW-YORK	2	1991
North River	NEW-YORK	2	1995
St Regis Fls	NEW-YORK	2	2007
S Reading	VERMONT	2	1986

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