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

Cassin's Sparrow In Tamaulipan Brushlands

All regionsTamaulipan BrushlandsGrassland birds

Cassin's Sparrow in Tamaulipan Brushlands has fallen sharply: down 54% on the route-weighted index since 1969.

-54%Since 1969
27Routes In Region
57Years

Notable Signals

long arc declinecomputed index

Cassin's Sparrow has fallen sharply in Tamaulipan Brushlands: down 54% on the route-weighted index since 1969.

Forecast

If the recent trend holds, Cassin's Sparrow in Tamaulipan Brushlands is projected to fall about 100% by 2029 — from 6.4 in 2024 to a central estimate of 0.00 (95% range 0.00–34). A 5-year backtest shows a typical error of ±185.9%, with 100% of held-out values landing inside the 95% band.

-100%Change by 2029
0.00Projected 2029 index
0.00–3495% range
±185.9%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
20250.000.0034
20260.000.0034
20270.000.0034
20280.000.0034
20290.000.0034

Routes In Tamaulipan Brushlands

Routes recording Cassin's Sparrow in Tamaulipan Brushlands.
CatarinaTEXAS592010
El IndioTEXAS442007
EncinalTEXAS282010
Millett 2TEXAS262024
MillettTEXAS182012
El SauzTEXAS162023
Pedro CreekTEXAS142010
George WestTEXAS132024
Catarina 2TEXAS132017
HondoTEXAS112024
ZapataTEXAS101987
GuerraTEXAS92023
Mirando CityTEXAS82024
DilleyTEXAS72024
RandadoTEXAS62024
KingsvilleTEXAS42024
Encinal 2TEXAS42022
RachalTEXAS32023
Catarina 3TEXAS32023
San YgnacioTEXAS21985
RaymondvilleTEXAS22024
Cavasara Cr.TEXAS22023
Agua NuevaTEXAS12023
La PryorTEXAS12010
ProgresoTEXAS12006

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