BirdAnalyst
Species · BCR 29 · BBS 2025 Release · 1966–2024

Gray Catbird In Piedmont

All regionsPiedmontGeneralists

Gray Catbird in Piedmont has held roughly steady: up 7% on the route-weighted index since 1968.

+7%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 →
166Routes In RegionSurvey 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 SignalsNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

No notable trend signals for Gray Catbird in Piedmont. See the full index history below.

Gray Catbird In Piedmont Population Forecast

If the recent trend holds, Gray Catbird in Piedmont is projected to stay roughly flat through 2029, near 13 (95% range 11–16). A 5-year backtest shows a typical error of ±10%, with 100% of held-out values landing inside the 95% band.

-4%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 →
13Projected 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 →
11–1695% 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 →
±10%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, Gray Catbird in Piedmont is projected to stay roughly flat through 2029, near 13 (95% range 11–16). A 5-year backtest shows a typical error of ±10%, 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 →
2025131116
2026131116
2027131116
2028131116
2029131116

Routes In Piedmont

Routes recording Gray Catbird in Piedmont.
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 →
EmmitsburgMARYLAND1092024
OlneyMARYLAND1042024
EarltonMARYLAND972024
CollegevillePENNSYLVANIA862024
MadonnaMARYLAND722022
Bachman MillMARYLAND662024
JacobusPENNSYLVANIA622024
Doe RunPENNSYLVANIA612024
Pleasant ValMARYLAND602024
West GrovePENNSYLVANIA601996
Croton 2NEW-JERSEY592024
EkloMARYLAND572018
WarfieldsbrgMARYLAND512024
ChathamPENNSYLVANIA482024
WheatonMARYLAND472024
GilletteNEW-JERSEY462024
TaylorstownVIRGINIA462010
CrotonNEW-JERSEY452007
RandallstownMARYLAND382013
Mt Gretna 2PENNSYLVANIA362022
IjamsvilleMARYLAND352024
SandbrookNEW-JERSEY342024
SchwenksvillPENNSYLVANIA332024
PottersvilleNEW-JERSEY302024
Van BibberMARYLAND292013

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