BirdAnalyst
Species · BCR 37 · BBS 2025 Release · 1966–2024

Bronzed Cowbird In Gulf Coastal Prairie

All regionsGulf Coastal PrairieGeneralists

Bronzed Cowbird in Gulf Coastal Prairie has surged: up 131% on the route-weighted index since 1971.

+131%Since 1971
16Routes In Region
51Years

Notable Signals

long arc increasecomputed index

Bronzed Cowbird has surged in Gulf Coastal Prairie: up 131% on the route-weighted index since 1971.

Forecast

If the recent trend holds, Bronzed Cowbird in Gulf Coastal Prairie is projected to rise about 94% by 2029 — from 2.5 in 2024 to a central estimate of 4.8 (95% range 1.1–8.5). A 5-year backtest shows a typical error of ±87.9%, with 100% of held-out values landing inside the 95% band.

+94%Change by 2029
4.8Projected 2029 index
1.1–8.595% range
±87.9%Backtest error
19692029
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected index95% low95% high
20254.60.868.3
20264.60.918.4
20274.70.968.4
20284.71.08.5
20294.81.18.5

Routes In Gulf Coastal Prairie

Routes recording Bronzed Cowbird in Gulf Coastal Prairie.
Loyola Beach 2TEXAS462024
Loyola BeachTEXAS402009
L. Atascosa NwrTEXAS322023
San PedroTEXAS142023
GlencoeLOUISIANA82011
Lag AtascosaTEXAS62024
BaysideTEXAS42010
Bayside 2TEXAS42004
Bayside 3TEXAS32019
LafitteLOUISIANA11990
Grand IsleLOUISIANA12018
PetronilaTEXAS12017
IndianolaTEXAS12023
WinnieTEXAS12015
Goliad PrairieTEXAS12015
McfaddinTEXAS12009

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