Bewick's Wren Population Analysis
Bewick's Wren has surged: up 85% on the route-weighted index since 1968.
About the Bewick's Wren
The Bewick's Wren (Thryomanes bewickii) is a North American member of the Wrens (Troglodytidae). In this analysis it is grouped with the forest birds.
- Size
- 4–8.5 in long (10–22 cm) — a small, energetic 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 1,070 Breeding Bird Survey routes across 29 states, most concentrated in the Southern Rockies / Colorado Plateau.
- Family
- Troglodytidae · Forest birds
Notable Bewick's Wren TrendsNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →
Bewick's Wren has surged in surveyed states: up 85% on the route-weighted index since 1968.
Bewick's Wren Population Forecast
If the recent trend holds, Bewick's Wren is projected to fall about 11% by 2030 — from 1.1 in 2025 to a central estimate of 0.98 (95% range 0.62–1.4). A 5-year backtest shows a typical error of ±34.6%, with 80% of held-out values landing inside the 95% band.
Where the Bewick's Wren Is Detected
BBS routes recording Bewick's Wren, sized by most recent count.
Bewick's Wren Population Trend by State
Bewick's Wren Population Trend by Region
Bird Conservation Regions are the ecological unit for trends.
Bewick's Wren Conservation Status
Our route-weighted index shows it up about 85% since 1968.
Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14. Trend is a route-weighted relative-abundance index, not an absolute population.