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Species · Pennsylvania · BBS 2025 Release · 1966–2024

Black-billed Cuckoo Population Trend in Pennsylvania

All statesGeneralists

Black-billed Cuckoo in Pennsylvania has fallen sharply: down 73% on the route-weighted index since 1968.

-73%Since 1968
126Routes In State
58Years

Notable Black-billed Cuckoo Trends in Pennsylvania

long arc declinecomputed index

Black-billed Cuckoo has fallen sharply in Pennsylvania: down 73% on the route-weighted index since 1968.

Black-billed Cuckoo Population Forecast in Pennsylvania

If the recent trend holds, Black-billed Cuckoo in Pennsylvania is projected to rise about 220% by 2029 — from 0.08 in 2024 to a central estimate of 0.25 (95% range 0.00–0.84). A 5-year backtest shows a typical error of ±97.9%, with 100% of held-out values landing inside the 95% band.

+220%Change by 2029
0.25Projected 2029 index
0.00–0.8495% range
±97.9%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
20250.290.000.87
20260.280.000.86
20270.270.000.85
20280.260.000.84
20290.250.000.84

Black-billed Cuckoo Survey Routes in Pennsylvania

Routes recording Black-billed Cuckoo in Pennsylvania.
Big Flat1119811975
Rasselas1020221971
Betula820221974
Starlight619921970
Wyalusing520231988
Sproul Sf-B520232005
Ryde420051970
Jeannette420161979
Eldred320151988
Kittanning320191972
Peru Mills320081967
Clearfield320021967
Doe Run319911972
Lovelton320162005
Akeley219791966
Sigel220211989
N Washington220211968
Rosecrans220231972
English Ctr219771966
Austinville220231970
Rush220151970
Waller220161981
Pocono Summit220151968
Hop Bottom220141967
Greentown220221973

Black-billed Cuckoo Population Trend in Other States

alabamaarkansascoloradoconnecticutdelawaregeorgiaidahoillinoisindianaiowakansaskentuckymainemarylandmassachusettsmichiganminnesotamissourimontananebraskanew-hampshirenew-jerseynew-yorknorth-carolinanorth-dakotaohiooklahomarhode-islandsouth-dakotatennesseetexasvermontvirginiawest-virginiawisconsinwyoming

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