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

Brewer's Blackbird In Chihuahuan Desert

All regionsChihuahuan DesertGeneralists

Brewer's Blackbird in Chihuahuan Desert has declined: down 43% on the route-weighted index since 1974.

-43%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 →
10Routes 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 →

No notable trend signals for Brewer's Blackbird in Chihuahuan Desert. See the full index history below.

Brewer's Blackbird In Chihuahuan Desert Population Forecast

If the recent trend holds, Brewer's Blackbird in Chihuahuan Desert is projected to fall about 100% by 2030 — from 0.25 in 2025 to a central estimate of 0.00 (95% range 0.00–0.65). A 5-year backtest shows a typical error of ±122.9%, 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 →
0.00–0.6595% 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 →
±122.9%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, Brewer's Blackbird in Chihuahuan Desert is projected to fall about 100% by 2030 — from 0.25 in 2025 to a central estimate of 0.00 (95% range 0.00–0.65). A 5-year backtest shows a typical error of ±122.9%, with 100% of held-out values landing inside the 95% band.19672030
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 →
20260.000.000.65
20270.000.000.65
20280.000.000.65
20290.000.000.65
20300.000.000.65

Routes In Chihuahuan Desert

Routes recording Brewer's Blackbird 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 →
JornadaNEW-MEXICO361977
RodeoNEW-MEXICO61986
Red RockNEW-MEXICO52025
CloudcroftNEW-MEXICO22025
Laborcita 2NEW-MEXICO22025
Hot SpringsTEXAS21967
Bear MtnTEXAS21989
GageNEW-MEXICO12004
LaborcitaNEW-MEXICO12005
AltudaTEXAS11986

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