Birds of the Soviet Union: (Ptitsy Sovetskogo Soyuza)

adults Altai Amu Darya apparently April Asia August bill Biotope birds black guillemot blackish Boundary of nesting breeding brown brownish clutch coast colonies color cranes crop dark Dement'ev Distribution early eastern Ecology eggs encountered extremely feeding females Field marks flight flocks gray gray heron grayish grebe guillemot Habitational status heron incubation irides islands July June juvenal plumage juveniles Kamchatka Kyzyl-Kum Lake Lenkoran little bittern loon lower March Maritime Territory migration molt murre neck nestlings northern Novaya Zemlya numbers Numerical status nuptial plumage observed obtained occasionally ocher October pairs pigeon Portenko primary remiges range rarely rectrices Region remex remiges River sandgrouse September Shul'pin small feathers southern Soviet Spangenberg species Spitsbergen steppes storks subspecies Sushkin Syr Darya tarsometatarsus Transcaucasia trees Turkmenia turtledove underparts upperparts Volga Volga delta water bodies western whitish wing coverts Wing of males winter plumage winter quarters Zarudnyi