Field signs. The head, neck, nadhvoste and ventral side white, back dark, ash-gray; primary mahovye black feathers, sometimes with white konchikami; white tail with a wide black stripe to peak. Do birds in the winter operenii greyish stains on the back of his head. Young birds dust-brown, darker on the back, dappled light kaemkami feathers; tail monochromatic, black and brown; primary mahovye feathers monochrome, with white tips. Wing 340-390 mm (Ivanov, Shtegman, 1978). Distribution. Coastal rocks and small islands the Sea of Japan - on the southern Kuril Islands (Iturup, Kunashir, Shikotan), the Lesser Kuril Islands ridges, islands in the Bay of Peter the Great, perhaps on-Moneron and southern Sakhalin (Ivanov, Shtegman, 1978). References. |
