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Species · BCR 26 · BBS 2026 Release · 1966–2025

Bronzed Cowbird In Mississippi Alluvial Valley

All regionsMississippi Alluvial ValleyGeneralists

Bronzed Cowbird in Mississippi Alluvial Valley has declined: down 25% on the route-weighted index since 2001.

-25%Since 2001TrendPercent 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 →
8Routes 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 →
23YearsYears 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 Bronzed Cowbird in Mississippi Alluvial Valley. See the full index history below.

Bronzed Cowbird In Mississippi Alluvial Valley Population Forecast

If the recent trend holds, Bronzed Cowbird in Mississippi Alluvial Valley is projected to fall about 71% by 2030 — from 0.14 in 2025 to a central estimate of 0.04 (95% range 0.00–0.12). A 5-year backtest shows a typical error of ±44.9%, with 80% of held-out values landing inside the 95% band.

-71%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 →
0.04Projected 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 →
0.00–0.1295% 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 →
±44.9%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 Mississippi Alluvial Valley is projected to fall about 71% by 2030 — from 0.14 in 2025 to a central estimate of 0.04 (95% range 0.00–0.12). A 5-year backtest shows a typical error of ±44.9%, with 80% of held-out values landing inside the 95% band.19882030
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 →
20260.050.000.13
20270.050.000.13
20280.040.000.13
20290.040.000.13
20300.040.000.12

Routes In Mississippi Alluvial Valley

Routes recording Bronzed Cowbird in Mississippi Alluvial Valley.
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 →
GibsonLOUISIANA42001
BrousvilleLOUISIANA42025
CarlisleLOUISIANA31988
BerwickLOUISIANA22002
RamahLOUISIANA12025
BelairLOUISIANA12012
KraemerLOUISIANA12024
Baton RougeLOUISIANA12013

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