Birds of the Soviet Union: (Ptitsy Sovetskogo Soyuza)

adults Africa Altai April Aral Sea August bars beak beginning Biotope birds blackish Breeding brood Buturlin buzzard Caucasus Central Asia chiefly clutches color common cuckoo cormorant cuckoo dark brown Diet Distribution eagle early east eastern Ecology eggs encountered Europe European extremely falcons feathers females flights flying forests gray grayish gyrfalcons Habitational status hawk Incubation Iran Islands July June juvenal juveniles Kamchatka Kazakhstan Kharkov Region Lake late Length of wing Maritime Territory mesoptiles molt mountains nesting range nesting territories nestlings nightjar northern Numerical status occasionally ocher owls pairs passage patches Peninsula plumage prey primary remiges rectrices remex remiges River russet saker falcons September Siberia southern species specimens spotted woodpecker steppe streaks subspecies Sushkin Syr-Darya tail tarsometatarsus Tien Shan toes Transbaikalia Transcaucasia trees tundra Turkestan Turkmenia underparts upper Ural Volga western whitish wing coverts Wing of males woodpecker Zarudnyi