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

Laughing Gull In Tamaulipan Brushlands

All regionsTamaulipan BrushlandsWetland birds

Laughing Gull in Tamaulipan Brushlands has edged down: down 19% on the route-weighted index since 1970.

-19%Since 1970TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
7Routes In RegionSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
52YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable SignalsNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

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

Laughing Gull In Tamaulipan Brushlands Population Forecast

If the recent trend holds, Laughing Gull in Tamaulipan Brushlands is projected to fall about 46% by 2029 — from 2.9 in 2024 to a central estimate of 1.6 (95% range 0.00–12). A 5-year backtest shows a typical error of ±1169.9%, with 100% of held-out values landing inside the 95% band.

-46%Change by 2029TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
1.6Projected 2029 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–1295% range95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
±1169.9%Backtest errorBacktest errorTypical error when we hold out the most recent years, forecast them, and compare to what actually happened. Lower means a more trustworthy projection.Full methodology →
If the recent trend holds, Laughing Gull in Tamaulipan Brushlands is projected to fall about 46% by 2029 — from 2.9 in 2024 to a central estimate of 1.6 (95% range 0.00–12). A 5-year backtest shows a typical error of ±1169.9%, with 100% of held-out values landing inside the 95% band.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 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →95% low95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →95% high95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
20251.90.0013
20261.80.0013
20271.70.0012
20281.60.0012
20291.60.0012

Routes In Tamaulipan Brushlands

Routes recording Laughing Gull in Tamaulipan Brushlands.
Recent countThe raw number of individuals recorded on this route in its most recent survey year. A single-route tally, not a trend.Full methodology →
KingsvilleTEXAS322024
ProgresoTEXAS282011
San YgnacioTEXAS61981
RachalTEXAS31978
HeidelbergTEXAS32024
George WestTEXAS11991
RaymondvilleTEXAS12023

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