BirdAnalyst
Species · BCR 37 · BBS 2026 Release · 1966–2025

Harris's Hawk In Gulf Coastal Prairie

All regionsGulf Coastal PrairieBirds of prey

Harris's Hawk in Gulf Coastal Prairie has held roughly steady: up 10% on the route-weighted index since 1994.

+10%Since 1994TrendPercent 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 →
6Routes 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 →
33YearsYears 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 Harris's Hawk in Gulf Coastal Prairie. See the full index history below.

Harris's Hawk In Gulf Coastal Prairie Population Forecast

If the recent trend holds, Harris's Hawk in Gulf Coastal Prairie is projected to fall about 24% by 2030 — from 0.41 in 2025 to a central estimate of 0.31 (95% range 0.02–0.59). A 5-year backtest shows a typical error of ±135.8%, with 100% of held-out values landing inside the 95% band.

-24%Change by 2030TrendPercent 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 →
0.31Projected 2030 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.02–0.5995% 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 →
±135.8%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, Harris's Hawk in Gulf Coastal Prairie is projected to fall about 24% by 2030 — from 0.41 in 2025 to a central estimate of 0.31 (95% range 0.02–0.59). A 5-year backtest shows a typical error of ±135.8%, with 100% of held-out values landing inside the 95% band.19922030
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 →
20260.290.010.58
20270.300.010.58
20280.300.020.59
20290.300.020.59
20300.310.020.59

Routes In Gulf Coastal Prairie

Routes recording Harris's Hawk in Gulf Coastal Prairie.
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 →
Loyola BeachTEXAS62009
Lag AtascosaTEXAS52025
L. Atascosa NwrTEXAS32025
PetronilaTEXAS21992
San PedroTEXAS22023
Loyola Beach 2TEXAS12025

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.