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
0.00–0.1495% range
±614.2%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2022 | 0.00 | 0.00 | 0.14 |
| 2023 | 0.00 | 0.00 | 0.14 |
| 2024 | 0.00 | 0.00 | 0.14 |
| 2025 | 0.00 | 0.00 | 0.14 |
| 2026 | 0.00 | 0.00 | 0.14 |
Routes In Piedmont
| Upper Xrds | MARYLAND | 4 | 2004 |
| Emmitsburg | MARYLAND | 3 | 1987 |
| Doe Run | PENNSYLVANIA | 3 | 1991 |
| Carters Brdg | VIRGINIA | 3 | 1981 |
| Bachman Mill | MARYLAND | 2 | 1984 |
| Collegeville | PENNSYLVANIA | 2 | 1981 |
| Taylorstown | VIRGINIA | 2 | 1985 |
| Tryme | VIRGINIA | 2 | 2011 |
| Shipman | VIRGINIA | 2 | 1995 |
| Whitesburg | GEORGIA | 1 | 1993 |
| Silver Spg | MARYLAND | 1 | 1989 |
| Olney | MARYLAND | 1 | 1981 |
| Warfieldsbrg | MARYLAND | 1 | 1990 |
| Fowblesburg | MARYLAND | 1 | 2009 |
| Eklo | MARYLAND | 1 | 1993 |
| Randallstown | MARYLAND | 1 | 1989 |
| Van Bibber | MARYLAND | 1 | 2000 |
| Theodore | MARYLAND | 1 | 2004 |
| Ijamsville | MARYLAND | 1 | 2012 |
| Sandbrook | NEW-JERSEY | 1 | 2017 |
| Croton | NEW-JERSEY | 1 | 2007 |
| Croton 2 | NEW-JERSEY | 1 | 2016 |
| Copeland | NORTH-CAROLINA | 1 | 1975 |
| Mt Gretna | PENNSYLVANIA | 1 | 1993 |
| Pottstown | PENNSYLVANIA | 1 | 1976 |
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.