the nominate subspecies, thought to be found in the inland part of the Russian Far East, Siberia to Yakutia and Okhotsk Coast south to Middle Volga, southern Ural, Tyumen and Yalutorovsky. The wing chord of males is whilst that of females is . A small sample of males weighed while one female weighed . Light and dark morphs occur in the nominate race, the former being much more numerous. This subspecies is likely the palest form of Ural owl, with some Siberian owls so completely whitish and faintly marked as to momentarily suggest a snowy owl (Bubo scandianus). The typical light morph has facial disc of dirty whitish to pale ochraceous-grey colour, while the rim around disc consists of rows of small dark spots. The upperparts are pale greyish-brown, mottled, spotted and streaked variously with whitish and dusky and the scapulars have a rather large area of white. The throat is whitish, while the remaining underside is very pale greyish-brown to dirty whitish with heavy but not dark brown streaking. The tarsi and toes are feathered in a pale greyish-brown to dirty whitish-cream colour.S. u. davidi (Sharpe, 1875)- The Père David's owl. It is found in the mountains of central China (Qinghai and Sichuan). There is debate over whether it is a separate species or an isolated subspecies of Ural owl.S. u. liturata (Tengmalm, 1795)- This race is found in northern Europe from eastern Norway, Lapland and elsewhere in Sweden, throughout the range in Finland, to the Baltic region (mainly northern Belarus), eastern Poland, the eastern Alps down, the easternmost Carpathian mountains, east to the Volga. Birds of this race sometimes intergrade in the eastern part of the range with the nominate subspecies. Wing chord of males is and in females is . Tail length is . Known body masses have been reported as in males. Despite being linearly smaller than S. u. marcoura, a large sample of female Ural owls in Finland showed that they were surprisingly some 16% heavier than those in Romania, with 542 averaging , with a range of . Some females of the subspecies though may weigh as little as and, unlike the Ural owl species overall, may show some level of compliance to Bergmann's rule. This race is fairly similar in appearance to the nominate form but averages a fair bit darker, with richer, darker brown streaking below in most birds that extends to