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Species · BCR 20 · BBS 2026 Release · 1966–2025

Brown-headed Cowbird In Edwards Plateau

All regionsEdwards PlateauGeneralists

Brown-headed Cowbird in Edwards Plateau has declined: down 44% on the route-weighted index since 1969.

-44%Since 1969TrendPercent 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 →
21Routes 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 Brown-headed Cowbird in Edwards Plateau. See the full index history below.

Brown-headed Cowbird In Edwards Plateau Population Forecast

If the recent trend holds, Brown-headed Cowbird in Edwards Plateau is projected to fall about 20% by 2030 — from 12 in 2025 to a central estimate of 9.8 (95% range 1.9–18). A 5-year backtest shows a typical error of ±16.4%, with 100% of held-out values landing inside the 95% band.

-20%Change by 2030TrendPercent 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 →
9.8Projected 2030 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
1.9–1895% 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 →
±16.4%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, Brown-headed Cowbird in Edwards Plateau is projected to fall about 20% by 2030 — from 12 in 2025 to a central estimate of 9.8 (95% range 1.9–18). A 5-year backtest shows a typical error of ±16.4%, with 100% of held-out values landing inside the 95% band.19672030
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 →
2026113.019
2027112.719
2028102.418
2029102.218
20309.81.918

Routes In Edwards Plateau

Routes recording Brown-headed Cowbird in Edwards Plateau.
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 →
GeorgetownTEXAS311985
Pidcoke 2TEXAS232025
BoerneTEXAS222025
UtopiaTEXAS212025
San SabaTEXAS192025
AdamsvilleTEXAS192025
Dripping SpgTEXAS172025
ManorTEXAS172024
HarperTEXAS152025
Indian MtnTEXAS122025
LeakeyTEXAS102025
FitzhughTEXAS91983
Valley SpgsTEXAS92025
RockspringTEXAS82025
MontellTEXAS72025
Manor 2TEXAS62025
Prairie Mtn.TEXAS42025
KempnerTEXAS32025
LeanderTEXAS32006
Allen CreekTEXAS22025
PidcokeTEXAS12017

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.