BirdAnalyst
Species · BCR 35 · BBS 2026 Release · 1966–2025

Harris's Hawk In Chihuahuan Desert

All regionsChihuahuan DesertBirds of prey

Harris's Hawk in Chihuahuan Desert has collapsed: down 85% on the route-weighted index since 1976.

-85%Since 1976TrendPercent 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 →
17Routes 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 →
35YearsYears 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 →

long arc declinecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Harris's Hawk has collapsed in Chihuahuan Desert: down 85% on the route-weighted index since 1976.

Harris's Hawk In Chihuahuan Desert Population Forecast

If the recent trend holds, Harris's Hawk in Chihuahuan Desert is projected to fall about 100% by 2030 — from 0.06 in 2025 to a central estimate of 0.00 (95% range 0.00–0.23). A 5-year backtest shows a typical error of ±135.8%, with 100% of held-out values landing inside the 95% band.

-100%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 →
0.00Projected 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 →
0.00–0.2395% 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 Chihuahuan Desert is projected to fall about 100% by 2030 — from 0.06 in 2025 to a central estimate of 0.00 (95% range 0.00–0.23). A 5-year backtest shows a typical error of ±135.8%, with 100% of held-out values landing inside the 95% band.19712030
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 →
20260.010.000.25
20270.010.000.24
20280.000.000.24
20290.000.000.23
20300.000.000.23

Routes In Chihuahuan Desert

Routes recording Harris's Hawk in Chihuahuan Desert.
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 →
LangtryTEXAS31995
Bitter LakeNEW-MEXICO22007
LongfellowTEXAS22002
AltudaTEXAS21998
GirvinTEXAS22009
PresidioTEXAS22025
Ft. StocktonTEXAS22009
Quitman Cyn.TEXAS22001
PumpvilleTEXAS22012
GageNEW-MEXICO12007
JornadaNEW-MEXICO12012
RodeoNEW-MEXICO12000
Sunshine WllNEW-MEXICO12014
ComstockTEXAS12002
OzonaTEXAS12001
Coyanda DrawTEXAS12008
Quitman Canyon 2TEXAS12018

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