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Species · Delaware · BBS 2025 Release · 1966–2024

Eastern Wood-Pewee Population Trend in Delaware

All statesAerial insectivores

Eastern Wood-Pewee in Delaware has surged: up 93% on the route-weighted index since 1968.

+93%Since 1968TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
17Routes In StateSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
58YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Eastern Wood-Pewee Trends in DelawareNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

long arc increasecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Eastern Wood-Pewee has surged in Delaware: up 93% on the route-weighted index since 1968.

Eastern Wood-Pewee Population Forecast in Delaware

If the recent trend holds, Eastern Wood-Pewee in Delaware is projected to stay roughly flat through 2029, near 7.3 (95% range 4.8–9.9). A 5-year backtest shows a typical error of ±9.8%, with 100% of held-out values landing inside the 95% band.

-8%Change by 2029TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
7.3Projected 2029 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
4.8–9.995% range95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
±9.8%Backtest errorBacktest errorTypical error when we hold out the most recent years, forecast them, and compare to what actually happened. Lower means a more trustworthy projection.Full methodology →
If the recent trend holds, Eastern Wood-Pewee in Delaware is projected to stay roughly flat through 2029, near 7.3 (95% range 4.8–9.9). A 5-year backtest shows a typical error of ±9.8%, with 100% of held-out values landing inside the 95% band.19662029
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →95% low95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →95% high95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
20257.14.59.7
20267.24.69.7
20277.24.79.8
20287.34.79.8
20297.34.89.9

Eastern Wood-Pewee Survey Routes in Delaware

Routes recording Eastern Wood-Pewee in Delaware.
Recent countThe raw number of individuals recorded on this route in its most recent survey year. A single-route tally, not a trend.Full methodology →
Blackbird1820241994
Harrington1420241966
Milton 21420172017
Mt Pleasant1020191966
Milton820161966
Frederica720141966
Pepperbox720161998
Lowes Xrds519911967
Frankford420121966
Millsboro420242017
Holleyville320041966
Pepperbox 2320242017
Dover219871966
Bethany Bch219891966
Georgetown220221992
Wilmington120141966
Holleyville 2120242006

Eastern Wood-Pewee Population Trend in Other States

alabamaarkansasconnecticutfloridageorgiaillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanew-hampshirenew-jerseynew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasvermontvirginiawest-virginiawisconsin

Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.