Northern Beardless-Tyrannulet
Northern Beardless-Tyrannulet has edged down: down 22% on the route-weighted index since 1971.
About the Northern Beardless-Tyrannulet
The Northern Beardless-Tyrannulet (Camptostoma imberbe) is a North American member of the Tyrant Flycatchers (Tyrannidae). In this analysis it is grouped with the aerial insectivores.
- Size
- 4.5–9 in long (12–23 cm) — a small to medium flycatcher (typical for the family)
- Habitat
- Open airspace over fields, water and towns; nests in cavities, earthen banks or on structures.
- Diet
- Flying insects caught on the wing.
- Range
- Recorded on 8 Breeding Bird Survey routes across 2 states, most concentrated in the Sierra Madre Occidental.
- Family
- Tyrannidae · Aerial insectivores
Notable Northern Beardless-Tyrannulet Trends
No notable trend signals for Northern Beardless-Tyrannulet. See the full index history below.
Northern Beardless-Tyrannulet Population Forecast
If the recent trend holds, Northern Beardless-Tyrannulet is projected to stay roughly flat through 2029, near 0.00 (95% range 0.00–0.01). A 5-year backtest shows a typical error of ±64.2%, with 100% of held-out values landing inside the 95% band.
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.00 | 0.00 | 0.01 |
| 2026 | 0.00 | 0.00 | 0.01 |
| 2027 | 0.00 | 0.00 | 0.01 |
| 2028 | 0.00 | 0.00 | 0.01 |
| 2029 | 0.00 | 0.00 | 0.01 |
Where the Northern Beardless-Tyrannulet Is Detected
BBS routes recording Northern Beardless-Tyrannulet, sized by most recent count.
Northern Beardless-Tyrannulet Population Trend by State
| Arizona | -45% | 1971 | 6 |
| Texas | insufficient data | n/a | 2 |
Northern Beardless-Tyrannulet Population Trend by Region
Bird Conservation Regions are the ecological unit for trends.
| Sierra Madre Occidental | -67% | 1971 | 6 |
Northern Beardless-Tyrannulet Conservation Status
Our route-weighted index shows it down about 22% since 1971. Aerial insectivores have fallen sharply across the continent, a decline widely linked to dwindling insect prey.
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22. Trend is a route-weighted relative-abundance index, not an absolute population.