BirdAnalyst
Guild · Nevada · BBS 2025 Release · 1966–2024

Arid-land Birds In Nevada

All statesNevada

8 species in this guild. As a group they are -60%Guild trendA mean-index aggregate across the species in this group — the structural direction of the guild, with individual-species noise smoothed out.Full methodology → since 1970.

Guild SignalsNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

guild collapsecomputed 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 →

Arid-land birds as a group have fallen sharply in Nevada, down 60% since 1970.

Arid-land Birds In Nevada Population Forecast

If the recent trend holds, Arid-land birds in Nevada is projected to fall about 90% by 2029 — from 2.7 in 2024 to a central estimate of 0.27 (95% range 0.00–9.4). A 5-year backtest shows a typical error of ±73.3%, with 100% of held-out values landing inside the 95% band.

-90%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 →
0.27Projected 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 →
0.00–9.495% 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 →
±73.3%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, Arid-land birds in Nevada is projected to fall about 90% by 2029 — from 2.7 in 2024 to a central estimate of 0.27 (95% range 0.00–9.4). A 5-year backtest shows a typical error of ±73.3%, with 100% of held-out values landing inside the 95% band.19682029
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 →
20250.780.009.9
20260.650.009.8
20270.530.009.7
20280.400.009.6
20290.270.009.4

Member Species In Nevada

Arid-land birds species in Nevada.
TrendPercent 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 →
Black-tailed GnatcatcherPolioptilidae-74%
Cactus WrenTroglodytidae-72%
Black-throated SparrowPasserellidae-54%
Greater RoadrunnerCuculidae-7%
VerdinRemizidae+127%
PhainopeplaPtiliogonatidae+354%
Gambel's QuailOdontophoridae+662%
Lucy's WarblerParulidae+923%

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