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

Common Grackle In Tamaulipan Brushlands

All regionsTamaulipan BrushlandsGeneralists

Common Grackle in Tamaulipan Brushlands has collapsed: down 84% on the route-weighted index since 1977.

-84%Since 1977
12Routes In Region
32Years

Notable Signals

long arc declinecomputed index

Common Grackle has collapsed in Tamaulipan Brushlands: down 84% on the route-weighted index since 1977.

Forecast

If the recent trend holds, Common Grackle in Tamaulipan Brushlands is projected to rise about 681% by 2029 — from 0.42 in 2024 to a central estimate of 3.3 (95% range 0.00–8.4). A 5-year backtest shows a typical error of ±1268.5%, with 100% of held-out values landing inside the 95% band.

+681%Change by 2029
3.3Projected 2029 index
0.00–8.495% range
±1268.5%Backtest error
19752029
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
20253.10.008.3
20263.10.008.3
20273.20.008.4
20283.20.008.4
20293.30.008.4

Routes In Tamaulipan Brushlands

Routes recording Common Grackle in Tamaulipan Brushlands.
El IndioTEXAS81998
Agua NuevaTEXAS62004
KingsvilleTEXAS42024
George WestTEXAS42022
ZapataTEXAS31976
EncinalTEXAS32008
La PryorTEXAS22004
LaredoTEXAS21999
Mirando CityTEXAS11979
HondoTEXAS12024
RaymondvilleTEXAS11990
MillettTEXAS11998

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