Thus, the species may be more correctly classified as cathemeral as is much of their main prey.  Use of 15 total nest boxes in Akademgorodok, Russia over three study years varied wildly based presumably on prey population cycles with anywhere from 0% to 50% used annually. , Species reintroductions have been undertaken in some different parts of Europe. Eskelinen, O., Sulkava, P., & Sulkava, R. (2004).  Compared to the tawny owl, the Ural owl is considerably larger in size and talon size (which is about 30% greater in the Ural), with the talon shape further indicating their different ecological roles, being proportionately shorter and more curved in tawny owls in accordance with its more varied diet and heavier and straighter in the Ural owl for dispatching relatively larger mammals. the tawny) from an eastern one inhabiting cold, boreal ranges (i.e.  The Ural owl is something of a dietary generalist like many members of the Strix genus, but it is usually locally reliant on small mammals, especially small rodents such as voles. The Ural owl has, for an owl, an exceptionally long tail that bears a wedge-shaped tip. Bolboaca, L. E., Iordache, I., & Ion, C. (2018).  Much further east in the Pacific coastal Primorsky Krai, 1163 total prey items were examined.  However, according to a study in southern Poland, Ural owls are generally less aggressive in the non-breeding seasons than are tawny owls to other owls and may be slightly tolerant of smaller owl species on their home range while the tawny is less so. , The hunting of birds by the Ural owl seems almost entirely based on opportunity as there is little evidence that they track down birds of any particular type, just merely upon the chance of encounter or detection. & Marks, J.S. , This is a fairly powerful species of owl.  Most especially, the Ural owl has often being compared and studied in areas of sympatry with its close cousin, the tawny owl.  Although predation events upon Ural owls are widely reported, the relative number of incidents of such are very low and singular.  In other languages, the species is referred to as Slaguggla, or “attacking owl”, in Swedish, Habichtskauz, or “goshawk-owl”, in German or as the “long-tailed owl” in Russian.  In most cases mentioned above, the age of the Ural owl taken by the predators are not usually specified (although any of the first three large eagles are certainly capable of striking down Ural owls potentially of any age).  Despite their potential predation on smaller mesopredators, when nest boxes for European pied flycatchers (Ficedula hypoleuca) were experimentally placed in the area of Ural owl nests, productivity lowered, and it is possibly because mesopredators were often attracted to the corresponding food base of the owls. in 2005-07 up to 1.7-2 pair per 10 km2 (3.9 sq mi) whereas in the past (i.e. Brommer, J. E., Pietiäinen, H., & Kolunen, H. (1998).  As for movements, as opposed to the sedentary adults, immatures may wander distances of up to about 150 km (93 mi). Usually, in nearly any part of the range, frogs and other amphibians constitute less than 6% of the regional diets for the species. Previous records indicated staple populations in the 1980s for Ural owls in the western Carpathian mountains (estimated at about 1000 pairs) and northern Belarus (at 50-100 pairs). Further, their wings measure around 10-15 inches in length.  In montane Slovenia, somewhat surprisingly, it is slightly later at late March into early June. The species pattern is mirrored in other bird species, i.e. In colour, it tends to be a plain pale greyish-brown to whitish overall (with more detailed description of their variation under subspecies), with a slightly darker grey-brown to brown back and mantle with contrasting whitish markings. Lee, M. Y., Lee, S. M., Jeon, H. S., Lee, S. H., Park, J. Y., & An, J. from Fennoscandia), in Estonia a highly variable breeding success rate was observed to be concurrently happening during prey population cycles.  In Slovakia, in addition to glades and meadows near tall forests, Ural owls have been somewhat acclimated to hunting in open areas that are human sourced, including areas of forest fragmentation and even agricultural areas and small towns if they are adjacent to mature forest patches.  Peak singing times in Finland during springtime are 10 pm-12 am and more intensely at 1-3 am, which differed from the peak times for nest visits.  Voous estimated the typical weight of males and females at 720 g (1.59 lb) and 870 g (1.92 lb), respectively. Here the tawny owl tends to occur at lower elevations while the Ural owl occupies the foothill forests at higher elevations. The densities of territories range between 0.9 to 13.4 territories per 10 km 2, and the highest densities are reached in montane forests of the southern dinaric region. The Ural owl is considerably smaller-bodied (around three times lighter), with a wingspan around 35% smaller and smaller talons and feet, so a competitive advantage is apparent even between the species’ morphology.  Its range in Russia is extensive but it is absent from areas where habitat is not favorable. The first wild breeding of an Ural pair in the Bohemian forest occurred in 1985 but the first successful breeding was not until 1989 (with the pair having producing 4 offspring). In colour, it tends to be a plain pale greyish-brown to whitish overall (with more detailed description of their variation under subspecies), with a slightly darker grey-brown to brown back and mantle with contrasting whitish markings. In colour, the great grey is distinctly more solidly uniform and somewhat dark greyish than the Ural owl. 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