BirdAnalyst
Species · BCR 21 · BBS 2026 Release · 1966–2025

Bronzed Cowbird In Oaks and Prairies

All regionsOaks and PrairiesGeneralists

Bronzed Cowbird in Oaks and Prairies has surged: up 98% on the route-weighted index since 1971.

+98%Since 1971TrendPercent 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 →
10Routes 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 →
47YearsYears 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 →

long arc increasecomputed 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 →

Bronzed Cowbird has surged in Oaks and Prairies: up 98% on the route-weighted index since 1971.

Bronzed Cowbird In Oaks and Prairies Population Forecast

If the recent trend holds, Bronzed Cowbird in Oaks and Prairies is projected to stay roughly flat through 2030, near 0.28 (95% range 0.00–0.96). A 5-year backtest shows a typical error of ±518.9%, with 100% of held-out values landing inside the 95% band.

n/aChange 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 →
0.28Projected 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 →
0.00–0.9695% 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 →
±518.9%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, Bronzed Cowbird in Oaks and Prairies is projected to stay roughly flat through 2030, near 0.28 (95% range 0.00–0.96). A 5-year backtest shows a typical error of ±518.9%, with 100% of held-out values landing inside the 95% band.19682030
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 →
20260.290.000.97
20270.290.000.97
20280.280.000.96
20290.280.000.96
20300.280.000.96

Routes In Oaks and Prairies

Routes recording Bronzed Cowbird in Oaks and Prairies.
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 →
FanninTEXAS52010
SchroederTEXAS31994
CampbelltonTEXAS22024
Lone OakTEXAS22008
Three RiversTEXAS22025
YoakumTEXAS21996
BriteTEXAS22023
HobsonTEXAS12024
MuldoonTEXAS11978
LockhartTEXAS11996

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