Species · BCR 29 · BBS 2025 Release · 1966–2024

Black-billed Cuckoo In Piedmont

Black-billed Cuckoo in Piedmont has collapsed: down 94% on the route-weighted index since 1968.

-94%Since 1968
35Routes In Region
43Years

Notable Signals

long arc declinecomputed index

Black-billed Cuckoo has collapsed in Piedmont: down 94% on the route-weighted index since 1968.

Forecast

If the recent trend holds, Black-billed Cuckoo in Piedmont is projected to stay roughly flat through 2026, near 0.00 (95% range 0.00–0.14). A 5-year backtest shows a typical error of ±614.2%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2026
0.00Projected 2026 index
0.000.1495% range
±614.2%Backtest error
19662026
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected index95% low95% high
20220.000.000.14
20230.000.000.14
20240.000.000.14
20250.000.000.14
20260.000.000.14

Routes In Piedmont

Routes recording Black-billed Cuckoo in Piedmont.
Upper XrdsMARYLAND42004
EmmitsburgMARYLAND31987
Doe RunPENNSYLVANIA31991
Carters BrdgVIRGINIA31981
Bachman MillMARYLAND21984
CollegevillePENNSYLVANIA21981
TaylorstownVIRGINIA21985
TrymeVIRGINIA22011
ShipmanVIRGINIA21995
WhitesburgGEORGIA11993
Silver SpgMARYLAND11989
OlneyMARYLAND11981
WarfieldsbrgMARYLAND11990
FowblesburgMARYLAND12009
EkloMARYLAND11993
RandallstownMARYLAND11989
Van BibberMARYLAND12000
TheodoreMARYLAND12004
IjamsvilleMARYLAND12012
SandbrookNEW-JERSEY12017
CrotonNEW-JERSEY12007
Croton 2NEW-JERSEY12016
CopelandNORTH-CAROLINA11975
Mt GretnaPENNSYLVANIA11993
PottstownPENNSYLVANIA11976

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