Oak Titmouse
Oak Titmouse has risen sharply: up 64% on the route-weighted index since 1970.
About the Oak Titmouse
The Oak Titmouse (Baeolophus inornatus) is a North American member of the Chickadees & Titmice (Paridae). In this analysis it is grouped with the forest birds.
- Size
- 4.5–6 in long (11–15 cm) — a tiny, 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 166 Breeding Bird Survey routes across 2 states, most concentrated in the Coastal California.
- Family
- Paridae · Forest birds
Notable Oak Titmouse Trends
Oak Titmouse has risen sharply in surveyed states: up 64% on the route-weighted index since 1970.
Oak Titmouse Population Forecast
If the recent trend holds, Oak Titmouse is projected to fall about 13% by 2029 — from 0.24 in 2024 to a central estimate of 0.21 (95% range 0.00–0.43). A 5-year backtest shows a typical error of ±15.6%, with 100% of held-out values landing inside the 95% band.
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.22 | 0.00 | 0.45 |
| 2026 | 0.22 | 0.00 | 0.44 |
| 2027 | 0.21 | 0.00 | 0.44 |
| 2028 | 0.21 | 0.00 | 0.43 |
| 2029 | 0.21 | 0.00 | 0.43 |
Where the Oak Titmouse Is Detected
BBS routes recording Oak Titmouse, sized by most recent count.
Oak Titmouse Population Trend by State
| California | +48% | 1970 | 156 |
| Oregon | -68% | 1971 | 10 |
Oak Titmouse Population Trend by Region
Bird Conservation Regions are the ecological unit for trends.
| Northern Pacific Rainforest | -50% | 1970 | 30 |
| Great Basin | +356% | 1980 | 9 |
| Sierra Nevada | -58% | 1971 | 20 |
| Coastal California | +61% | 1970 | 102 |
| Sonoran and Mojave Deserts | -45% | 1973 | 5 |
Oak Titmouse Conservation Status
Our route-weighted index shows it up about 64% 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.