BirdAnalyst
Species · BCR 36 · BBS 2025 Release · 1966–2024

Brown-headed Cowbird In Tamaulipan Brushlands

All regionsTamaulipan BrushlandsGeneralists

Brown-headed Cowbird in Tamaulipan Brushlands has fallen sharply: down 51% on the route-weighted index since 1969.

-51%Since 1969
28Routes In Region
57Years

Notable Signals

long arc declinecomputed index

Brown-headed Cowbird has fallen sharply in Tamaulipan Brushlands: down 51% on the route-weighted index since 1969.

Forecast

If the recent trend holds, Brown-headed Cowbird in Tamaulipan Brushlands is projected to fall about 33% by 2029 — from 13 in 2024 to a central estimate of 8.9 (95% range 0.00–19). A 5-year backtest shows a typical error of ±35.2%, with 100% of held-out values landing inside the 95% band.

-33%Change by 2029
8.9Projected 2029 index
0.00–1995% range
±35.2%Backtest error
19672029
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
20259.90.0020
20269.70.0020
20279.40.0020
20289.20.0020
20298.90.0019

Routes In Tamaulipan Brushlands

Routes recording Brown-headed Cowbird in Tamaulipan Brushlands.
HondoTEXAS472024
RachalTEXAS222023
George WestTEXAS222024
CatarinaTEXAS222010
DilleyTEXAS152024
ProgresoTEXAS142011
Millett 2TEXAS142024
KingsvilleTEXAS122024
ZapataTEXAS111987
EncinalTEXAS112010
GuerraTEXAS112023
SejitaTEXAS112024
RaymondvilleTEXAS102024
Catarina 3TEXAS102024
LaredoTEXAS102023
Agua NuevaTEXAS92023
Mirando CityTEXAS82024
Encinal 2TEXAS82024
El IndioTEXAS72007
MillettTEXAS52012
Cavasara Cr.TEXAS52023
RandadoTEXAS42024
Catarina 2TEXAS42017
San YgnacioTEXAS31985
Pedro CreekTEXAS32010

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