BirdAnalyst
Species · BCR 35 · BBS 2025 Release · 1966–2024

Brown-crested Flycatcher In Chihuahuan Desert

All regionsChihuahuan DesertAerial insectivores

Brown-crested Flycatcher in Chihuahuan Desert has risen sharply: up 64% on the route-weighted index since 1986.

+64%Since 1986TrendPercent 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 →
8Routes 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 →
30YearsYears 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 →

Brown-crested Flycatcher has risen sharply in Chihuahuan Desert: up 64% on the route-weighted index since 1986.

Brown-crested Flycatcher In Chihuahuan Desert Population Forecast

If the recent trend holds, Brown-crested Flycatcher in Chihuahuan Desert is projected to stay roughly flat through 2029, near 0.14 (95% range 0.00–0.30). A 5-year backtest shows a typical error of ±94.6%, with 80% of held-out values landing inside the 95% band.

-1%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 →
0.14Projected 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 →
0.00–0.3095% 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 →
±94.6%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, Brown-crested Flycatcher in Chihuahuan Desert is projected to stay roughly flat through 2029, near 0.14 (95% range 0.00–0.30). A 5-year backtest shows a typical error of ±94.6%, with 80% of held-out values landing inside the 95% band.19742029
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 →
20250.130.000.30
20260.130.000.30
20270.130.000.30
20280.140.000.30
20290.140.000.30

Routes In Chihuahuan Desert

Routes recording Brown-crested Flycatcher 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 →
Red RockNEW-MEXICO42024
AltudaTEXAS21986
CornudasTEXAS11985
OzonaTEXAS11998
CastolonTEXAS12006
Devils R CynTEXAS12016
ToyahvaleTEXAS11998
Quitman Canyon 2TEXAS12011

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