Field signs. The head and neck black, back light, sizovato-gray, the rest of the body of the white plumage; primary mahovye feathers with dark kaemkami on the back edge of the internal fan, some mahovye predvershinnymi feathers with black spots. Do birds in the winter operenii white head with gray spots on the back of his head, at ear feathers and the eye. The young birds from top to brown with ohristymi kaemkami at plumes; steering feathers with black kaemkoy on top. Wing 268-298 mm (Ivanov, Shtegman, 1978). Distribution. In Russia only zaletnaya bird, was produced in the south of Primorsky Krai, in the Kurile islands on the lake and on. Fertile in the Sikhote-Alin Reserve, was observed in winter in the south of Sakhalin (Ivanov, Shtegman, 1978). References. |
