Species · Delaware · BBS 2025 Release · 1966–2024
Black Vulture Population Trend in Delaware
Black Vulture in Delaware has surged: up 807% on the route-weighted index since 1973.
+807%Since 1973
16Routes In State
43Years
Notable Black Vulture Trends in Delaware
long arc increasecomputed index
Black Vulture has surged in Delaware: up 807% on the route-weighted index since 1973.
Black Vulture Population Forecast in Delaware
If the recent trend holds, Black Vulture in Delaware is projected to rise about 72% by 2029 — from 1.8 in 2024 to a central estimate of 3.1 (95% range 1.2–5.0). A 5-year backtest shows a typical error of ±28.4%, with 80% of held-out values landing inside the 95% band.
+72%Change by 2029
3.1Projected 2029 index
1.2–5.095% range
±28.4%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 2.8 | 0.95 | 4.7 |
| 2026 | 2.9 | 1.0 | 4.8 |
| 2027 | 3.0 | 1.1 | 4.9 |
| 2028 | 3.0 | 1.1 | 4.9 |
| 2029 | 3.1 | 1.2 | 5.0 |
Black Vulture Survey Routes in Delaware
| Milton | 12 | 2015 | 1984 |
| Frederica | 5 | 2014 | 1992 |
| Millsboro | 5 | 2021 | 2017 |
| Pepperbox 2 | 5 | 2024 | 2017 |
| Holleyville 2 | 4 | 2019 | 2015 |
| Milton 2 | 4 | 2017 | 2017 |
| Harrington | 3 | 2024 | 1980 |
| Georgetown | 3 | 2022 | 1999 |
| Mt Pleasant | 2 | 2016 | 1971 |
| Holleyville | 2 | 2004 | 1975 |
| Lowes Xrds | 2 | 1973 | 1972 |
| Wilmington | 1 | 2014 | 2000 |
| Dover | 1 | 1985 | 1985 |
| Frankford | 1 | 2012 | 1971 |
| Blackbird | 1 | 2024 | 1999 |
| Pepperbox | 1 | 2016 | 2000 |
Black Vulture Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.