Species · BCR 10 · BBS 2025 Release · 1966–2024
Black-billed Cuckoo In Northern Rockies
Black-billed Cuckoo in Northern Rockies has collapsed: down 92% on the route-weighted index since 1972.
-92%Since 1972
14Routes In Region
22Years
Notable Signals
long arc declinecomputed index
Black-billed Cuckoo has collapsed in Northern Rockies: down 92% on the route-weighted index since 1972.
Forecast
If the recent trend holds, Black-billed Cuckoo in Northern Rockies is projected to stay roughly flat through 2022, near 0.00 (95% range 0.00–0.21). A 5-year backtest shows a typical error of ±1124.6%, with 100% of held-out values landing inside the 95% band.
n/aChange by 2022
0.00Projected 2022 index
0.00–0.2195% range
±1124.6%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2018 | 0.00 | 0.00 | 0.21 |
| 2019 | 0.00 | 0.00 | 0.21 |
| 2020 | 0.00 | 0.00 | 0.21 |
| 2021 | 0.00 | 0.00 | 0.21 |
| 2022 | 0.00 | 0.00 | 0.21 |
Routes In Northern Rockies
| Otto | WYOMING | 4 | 1981 |
| Willow Creek 2 | MONTANA | 2 | 2014 |
| Basin | WYOMING | 2 | 1985 |
| Riverside | WYOMING | 2 | 1969 |
| Clark | WYOMING | 2 | 2017 |
| Centerville | IDAHO | 1 | 1984 |
| St Mary | MONTANA | 1 | 1989 |
| Augusta | MONTANA | 1 | 1981 |
| Twin Bridges | MONTANA | 1 | 1976 |
| Willow Creek | MONTANA | 1 | 1978 |
| Chestnut | MONTANA | 1 | 1989 |
| Laurel | MONTANA | 1 | 1997 |
| St. Mary 2 | MONTANA | 1 | 2012 |
| Moose | WYOMING | 1 | 1982 |
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.