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Species · Arizona · BBS 2025 Release · 1966–2024

Northern Beardless-Tyrannulet Population Trend in Arizona

All statesAerial insectivores

Northern Beardless-Tyrannulet in Arizona has declined: down 45% on the route-weighted index since 1971.

-45%Since 1971
6Routes In State
49Years

Notable Northern Beardless-Tyrannulet Trends in Arizona

No notable trend signals for Northern Beardless-Tyrannulet in Arizona. See the full index history below.

Northern Beardless-Tyrannulet Population Forecast in Arizona

If the recent trend holds, Northern Beardless-Tyrannulet in Arizona is projected to fall about 31% by 2029 — from 0.14 in 2024 to a central estimate of 0.10 (95% range 0.00–0.23). A 5-year backtest shows a typical error of ±22.4%, with 100% of held-out values landing inside the 95% band.

-31%Change by 2029
0.10Projected 2029 index
0.00–0.2395% range
±22.4%Backtest error
19692029
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected index95% low95% high
20250.100.000.23
20260.100.000.23
20270.100.000.23
20280.100.000.23
20290.100.000.23

Northern Beardless-Tyrannulet Survey Routes in Arizona

Routes recording Northern Beardless-Tyrannulet in Arizona.
Sahuarita320191992
Pomerene320241969
Patagonia120241969
Redington120211993
Amado120221993
Peña Blanca120241985

Northern Beardless-Tyrannulet Population Trend in Other States

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