Species · Delaware · BBS 2025 Release · 1966–2024
Clapper Rail Population Trend in Delaware
Clapper Rail in Delaware has surged: up 547% on the route-weighted index since 1968.
+547%Since 1968
8Routes In State
49Years
Notable Clapper Rail Trends in Delaware
long arc increasecomputed index
Clapper Rail has surged in Delaware: up 547% on the route-weighted index since 1968.
Clapper Rail Population Forecast in Delaware
If the recent trend holds, Clapper Rail in Delaware is projected to rise about 300% by 2029 — from 0.20 in 2024 to a central estimate of 0.80 (95% range 0.00–1.8). A 5-year backtest shows a typical error of ±169.6%, with 80% of held-out values landing inside the 95% band.
+300%Change by 2029
0.80Projected 2029 index
0.00–1.895% range
±169.6%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.77 | 0.00 | 1.8 |
| 2026 | 0.78 | 0.00 | 1.8 |
| 2027 | 0.79 | 0.00 | 1.8 |
| 2028 | 0.79 | 0.00 | 1.8 |
| 2029 | 0.80 | 0.00 | 1.8 |
Clapper Rail Survey Routes in Delaware
| Harrington | 14 | 2021 | 1966 |
| Milton | 4 | 1975 | 1971 |
| Bethany Bch | 3 | 1990 | 1967 |
| Lowes Xrds | 2 | 1976 | 1968 |
| Dover | 1 | 1979 | 1969 |
| Blackbird | 1 | 2024 | 1995 |
| Georgetown | 1 | 2011 | 1992 |
| Pepperbox 2 | 1 | 2018 | 2018 |
Clapper Rail Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.