Species · New Jersey · BBS 2025 Release · 1966–2024
Black-billed Cuckoo Population Trend in New Jersey
Black-billed Cuckoo in New Jersey has fallen sharply: down 68% on the route-weighted index since 1968.
-68%Since 1968
30Routes In State
54Years
Notable Black-billed Cuckoo Trends in New Jersey
long arc declinecomputed index
Black-billed Cuckoo has fallen sharply in New Jersey: down 68% on the route-weighted index since 1968.
Black-billed Cuckoo Population Forecast in New Jersey
If the recent trend holds, Black-billed Cuckoo in New Jersey is projected to stay roughly flat through 2029, near 0.00 (95% range 0.00–0.69). A 5-year backtest shows a typical error of ±38.6%, with 100% of held-out values landing inside the 95% band.
n/aChange by 2029
0.00Projected 2029 index
0.00–0.6995% range
±38.6%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.02 | 0.00 | 0.71 |
| 2026 | 0.01 | 0.00 | 0.70 |
| 2027 | 0.00 | 0.00 | 0.69 |
| 2028 | 0.00 | 0.00 | 0.69 |
| 2029 | 0.00 | 0.00 | 0.69 |
Black-billed Cuckoo Survey Routes in New Jersey
| Midvale | 3 | 1980 | 1970 |
| Dover | 3 | 2015 | 1977 |
| Spraguetown 2 | 2 | 2007 | 2005 |
| Toms River | 2 | 1969 | 1969 |
| Albion | 2 | 1990 | 1966 |
| Bennett Mill | 2 | 1971 | 1967 |
| Woodbury Hgt | 1 | 2019 | 2008 |
| Greenwich | 1 | 1977 | 1977 |
| Six Points | 1 | 2003 | 1981 |
| Ancora | 1 | 1976 | 1968 |
| Sandbrook | 1 | 2017 | 1970 |
| Holmansville | 1 | 1986 | 1969 |
| Clarksville | 1 | 1979 | 1979 |
| New Bedford | 1 | 1989 | 1969 |
| Croton | 1 | 2007 | 1978 |
| Hope | 1 | 1990 | 1971 |
| Kemah Lake | 1 | 2018 | 1980 |
| Bloomsbury | 1 | 2016 | 1969 |
| High Point | 1 | 2024 | 1988 |
| Keyport | 1 | 2004 | 1991 |
| Cranbury | 1 | 1997 | 1988 |
| Friendship | 1 | 2019 | 1977 |
| Pomona | 1 | 2008 | 1978 |
| Villas | 1 | 1981 | 1979 |
| Spraguetown | 1 | 1991 | 1977 |
Black-billed Cuckoo Population Trend in Other States
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Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.