BirdAnalyst
Species · Delaware · BBS 2025 Release · 1966–2024

Great Crested Flycatcher Population Trend in Delaware

All statesAerial insectivores

Great Crested Flycatcher in Delaware has surged: up 170% on the route-weighted index since 1968.

+170%Since 1968
17Routes In State
58Years

Notable Great Crested Flycatcher Trends in Delaware

long arc increasecomputed index

Great Crested Flycatcher has surged in Delaware: up 170% on the route-weighted index since 1968.

Great Crested Flycatcher Population Forecast in Delaware

If the recent trend holds, Great Crested Flycatcher in Delaware is projected to fall about 15% by 2029 — from 11 in 2024 to a central estimate of 9.7 (95% range 6.1–13). A 5-year backtest shows a typical error of ±25.3%, with 80% of held-out values landing inside the 95% band.

-15%Change by 2029
9.7Projected 2029 index
6.1–1395% range
±25.3%Backtest error
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 index95% low95% high
20259.15.613
20269.35.713
20279.45.913
20289.56.013
20299.76.113

Great Crested Flycatcher Survey Routes in Delaware

Routes recording Great Crested Flycatcher in Delaware.
Harrington2820241966
Pepperbox1620161998
Milton 21620172017
Pepperbox 21220242017
Frederica820141966
Millsboro720242017
Holleyville 2720242006
Holleyville620041966
Milton620161966
Mt Pleasant420191966
Frankford420121966
Lowes Xrds419911966
Wilmington320141967
Blackbird320241994
Georgetown320221992
Dover219871966
Bethany Bch119901966

Great Crested Flycatcher Population Trend in Other States

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

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