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

Green-tailed Towhee Population Trend in Nevada

All statesGeneralists

Green-tailed Towhee in Nevada has surged: up 157% on the route-weighted index since 1970.

+157%Since 1970TrendPercent 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 →
28Routes In StateSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
52YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Green-tailed Towhee Trends in NevadaNotable 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 →

Green-tailed Towhee has surged in Nevada: up 157% on the route-weighted index since 1970.

Green-tailed Towhee Population Forecast in Nevada

If the recent trend holds, Green-tailed Towhee in Nevada is projected to rise about 21% by 2029 — from 3.1 in 2024 to a central estimate of 3.7 (95% range 0.00–9.4). A 5-year backtest shows a typical error of ±57.8%, with 100% of held-out values landing inside the 95% band.

+21%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 →
3.7Projected 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 →
±57.8%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, Green-tailed Towhee in Nevada is projected to rise about 21% by 2029 — from 3.1 in 2024 to a central estimate of 3.7 (95% range 0.00–9.4). A 5-year backtest shows a typical error of ±57.8%, 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 →
20253.70.009.4
20263.70.009.4
20273.70.009.4
20283.70.009.4
20293.70.009.4

Green-tailed Towhee Survey Routes in Nevada

Routes recording Green-tailed Towhee in Nevada.
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 →
Dinner Sta4419931968
Bald Mtn.3720241992
Humboldt Nf3520191993
Humboldt Nf 23120242021
Austin3020182008
Ruby Valley2920011997
Jarbidge1020151997
Comins Lake820162005
Charleston Reservoir720242024
Walker Can520241974
Willis520241994
Fish Creek420211997
Hawthorne420011997
Val Of Fire220111999
Piute Mdws120242024
Calico Spr119741973
Midas119961990
Ranchogrande120171988
Sheldon Nwr120191992
Mizpah120141990
Virgin Creek119981998
Toiyabe Nf120161987
Eureka120081969
Illipah120191990
Ruby Valley 2120192004

Green-tailed Towhee Population Trend in Other States

arizonacaliforniacoloradoidahomontananew-mexicooregontexasutahwyoming

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