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

Gull-billed Tern In Tamaulipan Brushlands

All regionsTamaulipan BrushlandsWetland birds

Gull-billed Tern in Tamaulipan Brushlands has edged up: up 13% on the route-weighted index since 1985.

+13%Since 1985
4Routes In Region
28Years

Notable Signals

No notable trend signals for Gull-billed Tern in Tamaulipan Brushlands. See the full index history below.

Forecast

If the recent trend holds, Gull-billed Tern in Tamaulipan Brushlands is projected to rise about 271% by 2029 — from 0.17 in 2024 to a central estimate of 0.62 (95% range 0.00–2.8). A 5-year backtest shows a typical error of ±753.6%, with 100% of held-out values landing inside the 95% band.

+271%Change by 2029
0.62Projected 2029 index
0.00–2.895% range
±753.6%Backtest error
19792029
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
20250.650.002.9
20260.640.002.8
20270.630.002.8
20280.630.002.8
20290.620.002.8

Routes In Tamaulipan Brushlands

Routes recording Gull-billed Tern in Tamaulipan Brushlands.
ProgresoTEXAS32007
KingsvilleTEXAS11987
RaymondvilleTEXAS12024
HeidelbergTEXAS12024

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