© Copyright: Images: Simo Mikkonen, M. & W. von Wright: Svenska fåglar (Kansalliskirjasto, The National Library of Finland). Recording: Jan-Erik Bruun. All rights reserved.
- Name also: Eurasian Wren, Winter Wren
- Family: Wrens – Troglodytidae
- Appearance: Very small stocky perching birds with surprisingly loud calls. Short tail often held cocked upright. Upper parts cinnamon or reddish brown, underparts pale brownish. Most parts of plumage marked with dark, narrow crosswise stripes.
- Size: Length: 9–10.5 cm, weight 8–11.5 g.
- Nest: Ball-shaped, well concealed among small branches or vegetation, made of moss, dry fern leaves, thin spruce twigs and grass, lined with feathers.
- Breeding: 6–9 eggs laid in May, incubated by female for 12–20 days. Fledglings remain in nest for 12–20 days. Pairs may raise a second brood.
- Occurrence: Breeds in dense spruce thickets as far north as Southern Lapland. Finnish breeding population estimated at 50,000–120,000 pairs.
- Migration: By night. Leaves Finland September–November, returning April–May after wintering in Central Europe. May occasionally winter in Finland.
- Diet: Invertebrates.
- Calls: Alarm call loud and crackling. Song loud, joyful and varied.
The tiny Wren is the only member of its family found in Finland (and in the Old World). Wrens are stockily built, and often hold their short, reddish brown cross-striped tails cocked upright. Their upper parts are cinnamon or reddish brown and their underparts are paler brown. Their plumage is patterned with many dark, narrow crosswise stripes, and they have distinct whitish eyebrow stripes. Their narrow, sharp beaks are dark brown. Their legs are reddish brown and their irises are dark brown.