Siberian Accentor
Prunella montanella
棕眉山岩鹨
Introduction
A small passerine bird in the family Prunellidae (accentors). It breeds across northern Russia from the Ural Mountains eastward to the Pacific coast, with a second fragmented band across southern Siberia. The species is migratory, wintering in Korea, eastern China, and Mongolia, with rare occurrences in Japan. Its typical breeding habitat includes subarctic willow and birch forests, open coniferous woodland near rivers or bogs, spruce taiga, and mountain regions. In winter it occupies bushes and shrubs near streams, dry grassland, and woods. Notable traits include its skulking behavior and above-average ability to maintain body temperature in cold conditions. The species has an extensive breeding range of 2.2 million square kilometers and is evaluated as Least Concern by the IUCN, though climate change may affect northern breeding populations long-term.
Description
A small, compact bird averaging 14.5 centimeters in length and weighing 17.5 grams. The upperparts and wings are brown with bright chestnut streaking on the back, while the rump and tail are greyish-brown. Two narrow whitish bars mark the folded wings. The head features a dark brown crown, a distinctive long wide pale yellow supercilium (eyebrow), a blackish patch behind the eye, and grey sides to the neck. Underparts are ochre yellow, becoming strongly buff on the flanks and greyish on the lower belly, with rich chestnut streaks on the breast sides and flanks. The iris is warm red-brown, the sharply pointed bill is dark, and the legs are reddish. All plumages are similar, though females have duller underparts with weaker streaking. The subspecies P. m. badia is smaller and darker with richer brown upperparts, deeper buff underparts, and rustier flank streaks.
Identification
The only species potentially confused with this accentor is the black-throated accentor, as first-autumn birds of that species may have a relatively inconspicuous dark throat. However, the Siberian accentor can be distinguished by its rustier back coloration, yellow (not off-white) supercilium, and the absence of a white line below the black face mask. The species is generally skulking and readily disappears into cover when disturbed.
Distribution & Habitat
Breeds across a vast belt of northern Russia from just west of the Ural Mountains to the Pacific coast, with a second more fragmented band across southern Siberia. The species is migratory, wintering primarily in eastern China and Korea, with small numbers in Mongolia and rare occurrences in Japan. Breeding habitat consists of subarctic willow and birch forests and open coniferous woodland, often near rivers or bogs, though pairs also occur in mountains and spruce taiga. In winter, the species occupies bushes and shrubs near streams but may also be found in dry grassland and woods. Birds depart northern breeding areas from mid-September, passing through Mongolia from late March and reaching breeding grounds by May or June. Vagrants have been recorded across Europe, North America (mainly Alaska and British Columbia), and elsewhere.
Behavior & Ecology
The species is typically skulking, readily disappearing into cover. Diet consists mainly of insects picked from the ground or vegetation, including beetle larvae, with seeds also consumed in winter. Breeding occurs from June to August, with two broods possible in the south and one in the north. The nest is an open cup built 0.4-8 meters above ground in dense shrubs or tree forks, constructed from twigs and leaves and lined with hair or fine grasses. The female lays four to six glossy deep blue-green eggs measuring 18.6 by 13.7 millimeters, incubated for about ten days. Both parents feed the downy brown-black chicks. The call is a trisyllabic ti-ti-ti, while the male's song is a loud, high-pitched chirichiriri given from shrub or tree tops. Adults and juveniles undergo a complete or partial moult between July and September.
Conservation
Evaluated as Least Concern by the IUCN due to its extensive range and large, stable population. The breeding range covers approximately 2.2 million square kilometers. European population estimates range from 100 to 500 breeding pairs. Breeding densities vary from over 30 pairs per square kilometer in northwestern Russia to around 5 pairs per square kilometer in the eastern range, with exceptionally high densities of 7.4 birds per square kilometer recorded in the Taymyr Peninsula in 1983. As a northern breeding species, long-term threats may include climate change. The species is parasitized by the taiga tick, which can transmit Borrelia burgdorferi, the cause of Lyme disease.
Culture
The common name 'accentor' derives from the old scientific name for the Alpine accentor (Accentor collaris), originating from Late Latin meaning 'sing with another' (ad + cantor). The genus name Prunella comes from the German Braunelle ('dunnock'), a diminutive of braun ('brown'), while the specific name montanella is a diminutive of Latin montanus ('mountain'). No significant cultural or folklore associations are documented beyond these etymological origins.
Source: Wikipedia · CC BY-SA 3.0
Taxonomy
- Order
- Passeriformes
- Family
- Prunellidae
- Genus
- Prunella
- eBird Code
- sibacc
Subspecies (2)
-
Prunella montanella badia
breeds northeastern Siberia (lower Lena River to Sea of Okhotsk); winters in north-central and northeastern China
-
Prunella montanella montanella
breeds Ural Mountains to Altai, Lake Baikal, and Sikhote Alin Mountains; winters in north-central and northeastern China and Korea
Data Sources
Species description from Wikipedia, licensed under CC BY-SA 3.0.
Bird images and sounds sourced from GBIF, contributed by citizen scientists worldwide under Creative Commons licenses.
Taxonomy data from AviList 2025.