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

Black-bellied Whistling-Duck In Tamaulipan Brushlands

All regionsTamaulipan BrushlandsWaterfowl

Black-bellied Whistling-Duck in Tamaulipan Brushlands has surged: up 217% on the route-weighted index since 1969.

+217%Since 1969
28Routes In Region
57Years

Notable Signals

long arc increasecomputed index

Black-bellied Whistling-Duck has surged in Tamaulipan Brushlands: up 217% on the route-weighted index since 1969.

Forecast

If the recent trend holds, Black-bellied Whistling-Duck in Tamaulipan Brushlands is projected to stay roughly flat through 2029, near 9.8 (95% range 0.00–23). A 5-year backtest shows a typical error of ±61.1%, with 100% of held-out values landing inside the 95% band.

+10%Change by 2029
9.8Projected 2029 index
0.00–2395% range
±61.1%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
20259.70.0023
20269.70.0023
20279.80.0023
20289.80.0023
20299.80.0023

Routes In Tamaulipan Brushlands

Routes recording Black-bellied Whistling-Duck in Tamaulipan Brushlands.
HeidelbergTEXAS612024
Pedro CreekTEXAS542005
ProgresoTEXAS262011
KingsvilleTEXAS182024
La PryorTEXAS142017
George WestTEXAS132023
RaymondvilleTEXAS112024
HondoTEXAS92024
Agua NuevaTEXAS62014
El IndioTEXAS62001
ZapataTEXAS51987
DilleyTEXAS52023
EncinalTEXAS42010
San YgnacioTEXAS41982
SejitaTEXAS42024
MillettTEXAS42012
Millett 2TEXAS32022
RachalTEXAS22019
RandadoTEXAS22024
Mirando CityTEXAS22019
El SauzTEXAS22023
Catarina 2TEXAS22017
Encinal 2TEXAS22024
Catarina 3TEXAS22023
LaredoTEXAS22023

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