BirdAnalyst
Species · BCR 19 · BBS 2025 Release · 1966–2024

Chihuahuan Raven In Central Mixed Grass Prairie

All regionsCentral Mixed Grass PrairieGeneralists

Chihuahuan Raven in Central Mixed Grass Prairie has surged: up 208% on the route-weighted index since 1974.

+208%Since 1974TrendPercent 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 →
20Routes 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 →
49YearsYears 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 increasecomputed 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 surged in Central Mixed Grass Prairie: up 208% on the route-weighted index since 1974.

Chihuahuan Raven In Central Mixed Grass Prairie Population Forecast

If the recent trend holds, Chihuahuan Raven in Central Mixed Grass Prairie is projected to fall about 18% by 2029 — from 0.30 in 2024 to a central estimate of 0.24 (95% range 0.00–0.49). A 5-year backtest shows a typical error of ±70.1%, with 80% of held-out values landing inside the 95% band.

-18%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 →
0.24Projected 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 →
0.00–0.4995% 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 →
±70.1%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 Central Mixed Grass Prairie is projected to fall about 18% by 2029 — from 0.30 in 2024 to a central estimate of 0.24 (95% range 0.00–0.49). A 5-year backtest shows a typical error of ±70.1%, with 80% of held-out values landing inside the 95% band.19712029
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 →
20250.240.000.48
20260.240.000.48
20270.240.000.48
20280.240.000.49
20290.240.000.49

Routes In Central Mixed Grass Prairie

Routes recording Chihuahuan Raven in Central Mixed Grass 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 →
ClarendonTEXAS182021
WilliamsTEXAS82024
EldoradoTEXAS61977
LakeviewTEXAS52024
Pear ValleyTEXAS42014
WeinertTEXAS31994
HaskellTEXAS32024
GirardTEXAS32023
CoatsKANSAS21989
GraybackTEXAS22021
MertzonTEXAS22011
HackberryTEXAS22024
RotanTEXAS22024
Shields 2TEXAS22023
GrimesOKLAHOMA11984
ErickOKLAHOMA11988
WinchellTEXAS11974
ChildressTEXAS12023
WallTEXAS12017
SilverTEXAS12016

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