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

Black-billed Cuckoo Population Trend in Georgia

All statesGeneralists

Black-billed Cuckoo in Georgia has collapsed: down 77% on the route-weighted index since 1973.

-77%Since 1973TrendPercent 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 →
5Routes 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 →
21YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Black-billed Cuckoo Trends in GeorgiaNotable 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 declinecomputed 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 →

Black-billed Cuckoo has collapsed in Georgia: down 77% on the route-weighted index since 1973.

Black-billed Cuckoo Population Forecast in Georgia

If the recent trend holds, Black-billed Cuckoo in Georgia is projected to stay roughly flat through 2007, near 0.00 (95% range 0.00–0.05). A 5-year backtest shows a typical error of ±56.2%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2007TrendPercent 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 →
0.00Projected 2007 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.0595% 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 →
±56.2%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, Black-billed Cuckoo in Georgia is projected to stay roughly flat through 2007, near 0.00 (95% range 0.00–0.05). A 5-year backtest shows a typical error of ±56.2%, with 100% of held-out values landing inside the 95% band.19702007
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 →
20030.000.000.05
20040.000.000.05
20050.000.000.05
20060.000.000.05
20070.000.000.05

Black-billed Cuckoo Survey Routes in Georgia

Routes recording Black-billed Cuckoo in Georgia.
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 →
Linwood119801970
Shannon119951995
Baxter120021975
Oakman119941972
Whitesburg119931993

Black-billed Cuckoo Population Trend in Other States

alabamaarkansascoloradoconnecticutdelawareidahoillinoisindianaiowakansaskentuckymainemarylandmassachusettsmichiganminnesotamissourimontananebraskanew-hampshirenew-jerseynew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-dakotatennesseetexasvermontvirginiawest-virginiawisconsinwyoming

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