Species · Delaware · BBS 2025 Release · 1966–2024
Eastern Whip-poor-will Population Trend in Delaware
Eastern Whip-poor-will in Delaware has collapsed: down 86% on the route-weighted index since 1968.
-86%Since 1968
9Routes In State
29Years
Notable Eastern Whip-poor-will Trends in Delaware
long arc declinecomputed index
Eastern Whip-poor-will has collapsed in Delaware: down 86% on the route-weighted index since 1968.
Eastern Whip-poor-will Population Forecast in Delaware
If the recent trend holds, Eastern Whip-poor-will in Delaware is projected to fall about 100% by 2022 — from 0.33 in 2017 to a central estimate of 0.00 (95% range 0.00–1.2). A 5-year backtest shows a typical error of ±152.9%, with 100% of held-out values landing inside the 95% band.
-100%Change by 2022
0.00Projected 2022 index
0.00–1.295% range
±152.9%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2018 | 0.00 | 0.00 | 1.2 |
| 2019 | 0.00 | 0.00 | 1.2 |
| 2020 | 0.00 | 0.00 | 1.2 |
| 2021 | 0.00 | 0.00 | 1.2 |
| 2022 | 0.00 | 0.00 | 1.2 |
Eastern Whip-poor-will Survey Routes in Delaware
| Lowes Xrds | 6 | 1991 | 1966 |
| Frankford | 2 | 1972 | 1967 |
| Milton 2 | 2 | 2017 | 2017 |
| Harrington | 1 | 2000 | 1966 |
| Frederica | 1 | 2000 | 1971 |
| Holleyville | 1 | 2003 | 1966 |
| Bethany Bch | 1 | 1967 | 1967 |
| Milton | 1 | 1978 | 1966 |
| Georgetown | 1 | 2004 | 1992 |
Eastern Whip-poor-will Population Trend in Other States
alabamaarkansasconnecticutgeorgiaillinoisindianaiowakansaskentuckymainemarylandmassachusettsmichiganminnesotamississippimissourinebraskanew-hampshirenew-jerseynew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasvermontvirginiawest-virginiawisconsin
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.