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

Olive Sparrow In Tamaulipan Brushlands

All regionsTamaulipan BrushlandsGeneralists

Olive Sparrow in Tamaulipan Brushlands has surged: up 725% on the route-weighted index since 1969.

+725%Since 1969
28Routes In Region
57Years

Notable Signals

long arc increasecomputed index

Olive Sparrow has surged in Tamaulipan Brushlands: up 725% on the route-weighted index since 1969.

Forecast

If the recent trend holds, Olive Sparrow in Tamaulipan Brushlands is projected to fall about 22% by 2029 — from 18 in 2024 to a central estimate of 14 (95% range 8.9–18). A 5-year backtest shows a typical error of ±20.1%, with 60% of held-out values landing inside the 95% band.

-22%Change by 2029
14Projected 2029 index
8.9–1895% range
±20.1%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
2025137.918
2026138.218
2027138.418
2028138.618
2029148.918

Routes In Tamaulipan Brushlands

Routes recording Olive Sparrow in Tamaulipan Brushlands.
EncinalTEXAS422010
George WestTEXAS362024
Millett 2TEXAS352024
SejitaTEXAS292024
KingsvilleTEXAS232024
HondoTEXAS232024
Agua NuevaTEXAS222023
RachalTEXAS182023
RandadoTEXAS162024
Mirando CityTEXAS162024
CatarinaTEXAS162010
El SauzTEXAS142023
Catarina 3TEXAS112024
RaymondvilleTEXAS102024
GuerraTEXAS92023
MillettTEXAS92012
La PryorTEXAS82017
DilleyTEXAS82024
LaredoTEXAS62021
San YgnacioTEXAS51982
Pedro CreekTEXAS42010
Cavasara Cr.TEXAS42023
Encinal 2TEXAS32024
Catarina 2TEXAS22017
ZapataTEXAS11983

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