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Species · Arizona · BBS 2025 Release · 1966–2024

Thick-billed Kingbird Population Trend in Arizona

All statesAerial insectivores

Thick-billed Kingbird in Arizona has increased: up 36% on the route-weighted index since 1979.

+36%Since 1979TrendPercent 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 →
3Routes 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 →
40YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Thick-billed Kingbird Trends in ArizonaNotable 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 Thick-billed Kingbird in Arizona. See the full index history below.

Thick-billed Kingbird Population Forecast in Arizona

If the recent trend holds, Thick-billed Kingbird in Arizona is projected to fall about 72% by 2029 — from 0.09 in 2024 to a central estimate of 0.02 (95% range 0.00–0.27). A 5-year backtest shows a typical error of ±67.1%, with 100% of held-out values landing inside the 95% band.

-72%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 →
0.02Projected 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 →
0.00–0.2795% 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 →
±67.1%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, Thick-billed Kingbird in Arizona is projected to fall about 72% by 2029 — from 0.09 in 2024 to a central estimate of 0.02 (95% range 0.00–0.27). A 5-year backtest shows a typical error of ±67.1%, with 100% of held-out values landing inside the 95% band.19752029
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 →
20250.030.000.28
20260.030.000.28
20270.030.000.28
20280.030.000.28
20290.020.000.27

Thick-billed Kingbird Survey Routes in Arizona

Routes recording Thick-billed Kingbird in Arizona.
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 →
Patagonia320241975
Peña Blanca220061977
Amado120071999

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