Red-faced Warbler
Red-faced Warbler has surged: up 769% on the route-weighted index since 1970.
About the Red-faced Warbler
The Red-faced Warbler (Cardellina rubrifrons) is a North American member of the Wood-Warblers (Parulidae). In this analysis it is grouped with the forest birds.
- Size
- 4.5–5.5 in long (11–14 cm) — a small, active songbird (typical for the family)
- Habitat
- Woodlands and forest edges, including wooded suburbs and parks.
- Diet
- Insects and spiders gleaned from foliage and bark, with seeds and berries in season.
- Range
- Recorded on 19 Breeding Bird Survey routes across 2 states, most concentrated in the Sierra Madre Occidental.
- Family
- Parulidae · Forest birds
Notable Red-faced Warbler Trends
No notable trend signals for Red-faced Warbler. See the full index history below.
Red-faced Warbler Population Forecast
If the recent trend holds, Red-faced Warbler is projected to stay roughly flat through 2029, near 0.03 (95% range 0.01–0.04). A 5-year backtest shows a typical error of ±44.7%, with 80% of held-out values landing inside the 95% band.
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.03 | 0.01 | 0.04 |
| 2026 | 0.03 | 0.01 | 0.04 |
| 2027 | 0.03 | 0.01 | 0.04 |
| 2028 | 0.03 | 0.01 | 0.04 |
| 2029 | 0.03 | 0.01 | 0.04 |
Where the Red-faced Warbler Is Detected
BBS routes recording Red-faced Warbler, sized by most recent count.
Red-faced Warbler Population Trend by State
| Arizona | +402% | 1970 | 15 |
| New Mexico | +33% | 1993 | 4 |
Red-faced Warbler Population Trend by Region
Bird Conservation Regions are the ecological unit for trends.
| Sierra Madre Occidental | +243% | 1970 | 18 |
Red-faced Warbler Conservation Status
Our route-weighted index shows it up about 769% since 1970.
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22. Trend is a route-weighted relative-abundance index, not an absolute population.