Gray Bunting Emberiza variabilis Scientific name definitions

José Luis Copete
Version: 1.0 — Published March 4, 2020
Text last updated September 4, 2017

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Field Identification

14–17 cm; 20·9–30 g. Male breeding is distinctive, sometimes with dusky lores, other­wise entire head, upperparts and underparts dark slate-grey, mantle with some blackish-brown streaks , belly somewhat paler, undertail-coverts with whitish feather edges; tail dark brown, feathers with bluish-grey edges; upperwing-coverts also slaty grey, centre of each feather darker, tertials dark brown with greyish (on inner feather) to rufous-brown (outer tertial) edges, primaries and secondaries dark brown with grey-brown or brownish edges; iris dark chestnut-brown; upper mandible dark grey with pale pinkish cutting edge, lower mandible pale pinkish with blackish on tip and along part of underside; legs pinkish. Male non-breeding is very similar to breeding, but grey areas of plumage partly obscured by brownish or buffish fringes of fresh feathers; brown fringes may give impression of lateral crownstripes, and buffish fringes can help to produce impression of faint supercilium and median crownstripe. First-winter male has crown olive-grey, tinged rufous, slate-grey supercilium, ear-coverts, sides of neck and throat; mantle and scapulars olive grey-brown, streaked dark brown, back to uppertail-coverts slate-grey with rufous-chestnut feather tips (tips partly concealing general slaty pattern), greater and median upperwing-coverts blackish with blue-grey edges and buffish tips (two wingbars), blackish-brown flight-feathers, tertials with rufous outer edge at tip of inner web, primaries and secondaries with buff edges (more rufous on secondaries), tail blackish-brown, central pair of rectrices rufescent brown; underparts buffish-white mixed with pale slaty, palest on belly, some streaks on flanks; iris dark grey-brown. First-summer male is similar to male breeding, but with brownish cast, and rump shows some rufous. Female breeding is similar to first-winter male, lacking slaty tones on head, rump and underparts, has malar stripe greyish, throat and underparts whitish-buff with dusky streaks, belly whiter; iris dark chestnut-brown. Female non-breeding is similar to breeding, but with fresh plumage. First-winter female is similar to female non-breeding, but upperparts more rufescent, supercilium, submoustachial stripe and throat paler, and iris dark grey-brown. Juvenile has olive-buffish supercilium and lores, with ear-coverts and side of neck olive-brown, malar stripe dark greyish, mantle more diffusely streaked than in subsequent plumages, scapulars chestnut-brown with dark centres, back, rump and uppertail-coverts uniformly rufous-chestnut, breast olive-buffish with more prominent black streaks than in subsequent plumages, belly and flanks indistinctly streaked; iris dark grey-brown, legs pinkish.

Systematics History

Sometimes placed in genus Schoeniclus or, in the past, in Ocyris. Birds from Kamchatka sometimes separated as race musica. Monotypic.

Subspecies

Monotypic.

Distribution

E Russia (S Kamchatka), Kuril Is, S Sakhalin and Japan (Hokkaido S to C Honshu). Winters mainly in S half of Honshu, Shikoku, Kyushu and Ryukyu Is (S to Okinawa); rarely in S Korea.

Habitat

Favours mixed deciduous and coniferous forest at middle and subalpine elevations, usually with dense vegetation, with undergrowth and thickets of dwarf bamboo (Sasa paniculata); also in alder (Alnus), willows (Salix) and birch (Betula) forests. In mountains and hills, from c. 1000 m to 1800 m. During winter found in dense vegetation, usually in evergreen-forest undergrowth near streams; also in parks and suburban gardens, even in centre of big cities (e.g. Tokyo), and in open cultivations where isolated stands of trees present.

Movement

Migratory. Autumn migration begins in Aug in N part of range, but main passage in Kuril Is during Sept, with small number into Nov; leaves winter quarters during Mar and Apr, and main period of passage N in Kuril Is during second half May. Accidental in S Ryukyu Is (including Iriomote), and E coast of China (Shaweishan I, off Shanghai), Taiwan and Korea, also Commander Is, Vladivostok area of Russia, and Alaska (W Aleutians).

Diet and Foraging

Diet insufficiently known; appears to include small invertebrates, seeds and small fruits and berries. Usually forages on ground . Secretive. Generally singly and in pairs, including in non-breeding season; during migration sometimes in small groups of up to five or six individuals.

Sounds and Vocal Behavior

Song , from inconspicuous perch inside bush or undergrowth, usually starts with soft drawn-out note, and is slow, with 3–5 distinctive notes, “swee swee chi-chi-chi” or “hsuuu twis-twis-twis”, or quicker versions e.g. “hsuuu tsisisisisis”. Call a sharp “tzii”, similar to that of E. spodocephala.

Breeding

Season begins during Jun, with peak in Jul. Nest built from twigs and dead leaves of dwarf bamboo, also grasses, located on stems of dwarf bamboo or in low bush, usually below 1 m. Clutch 3–5 eggs, greyish-white, with purple-greyish dashes at blunt end; incubation by both sexes, period 12 days; chicks fed by both parents, nestling period 11 days.

Not globally threatened (Least Concern). Uncommon in most of range; locally common. Global population not reliably estimated, but no signs of decrease and considered stable.

Distribution of the Gray Bunting - Range Map
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  • Year-round
  • Migration
  • Breeding
  • Non-Breeding
Distribution of the Gray Bunting

Recommended Citation

Copete, J.L. (2020). Gray Bunting (Emberiza variabilis), version 1.0. In Birds of the World (J. del Hoyo, A. Elliott, J. Sargatal, D. A. Christie, and E. de Juana, Editors). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.grybun.01
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