- 3.1–4.7 in
- 4.7–6.3 in
- 0.3–0.4 oz
- Pacific Wrens sometimes roost communally in cold weather. In one case, 31 individuals were found together in a nest box in western Washington.
Coniferous and mixed forests, primarily with dense understory, often near water.
Invertebrates, including insects, insect larvae, millipedes, spiders, and others.
- Clutch Size
- 1–9 eggs
- Egg Description
- White, with variable reddish brown spotting.
- Condition at Hatching
- Helpless with little down.
Domed structure with entrance hole on side, made of moss, bark, twigs, rootlets, grass, feathers, hair, and decayed wood, lined with feathers and hair. Placed in hole. May use existing cavities, such as woodpecker holes, excavate holes in banks, or build nests on root bases and branches.
Feeds methodically in low shrubs, on the ground, near the bases of trees, and around fallen dead wood.
Pacific Wren populations declined in several Northwest areas, but overall, numbers remained stable between 1966 and 2014, according to the North American Breeding Bird Survey. Partners in Flight estimates a global breeding population of 6 million with 73% spending part of the year in the U.S., and 41% in Canada. The species rates a 9 out of 20 on the Continental Concern Score, and is a U.S.-Canada Stewardship Species. Pacific Wren is not on the 2014 State of the Birds Watch List.
- Hejl, S. J., J. A. Holmes, and D. E. Kroodsma. 2002. Winter Wren (Troglodytes troglodytes). In The Birds of North America, No. 623 (A. Poole and F. Gill, eds.). The Birds of North America, Inc., Philadelphia, PA.
- North American Bird Conservation Initiative, U.S. Committee. 2014. State of the Birds 2014 Report. U.S. Department of Interior, Washington, DC.
- Partners in Flight. 2012. Species assessment database.
- USGS Patuxent Wildlife Research Center. 2014. North American Breeding Bird Survey 1966–2014 Analysis.