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Species · BCR 20 · BBS 2025 Release · 1966–2024

Chihuahuan Raven In Edwards Plateau

All regionsEdwards PlateauGeneralists

Chihuahuan Raven in Edwards Plateau has fallen sharply: down 59% on the route-weighted index since 1975.

-59%Since 1975TrendPercent 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 →
5Routes 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 →
26YearsYears 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 →

Chihuahuan Raven has fallen sharply in Edwards Plateau: down 59% on the route-weighted index since 1975.

Chihuahuan Raven In Edwards Plateau Population Forecast

If the recent trend holds, Chihuahuan Raven in Edwards Plateau is projected to rise about 33% by 2029 — from 0.13 in 2024 to a central estimate of 0.17 (95% range 0.00–0.45). A 5-year backtest shows a typical error of ±246.2%, with 100% of held-out values landing inside the 95% band.

+33%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 →
0.17Projected 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 →
0.00–0.4595% 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 →
±246.2%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, Chihuahuan Raven in Edwards Plateau is projected to rise about 33% by 2029 — from 0.13 in 2024 to a central estimate of 0.17 (95% range 0.00–0.45). A 5-year backtest shows a typical error of ±246.2%, with 100% of held-out values landing inside the 95% band.19692029
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 →
20250.180.000.46
20260.170.000.45
20270.170.000.45
20280.170.000.45
20290.170.000.45

Routes In Edwards Plateau

Routes recording Chihuahuan Raven in Edwards Plateau.
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 →
MontellTEXAS32007
RockspringTEXAS32016
UtopiaTEXAS22000
San SabaTEXAS21986
Indian MtnTEXAS22024

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