Responsive to his call,—with quivering peals,  Young individuals can sometimes be diagnosed to age roughly by the state of wing moult. They feed mainly on small mammals like rodents and rabbits. (1994). Egg dimensions were found to average 46.7 mm × 39.1 mm (1.84 in × 1.54 in) in Britain, 47.6 mm × 39.2 mm (1.87 in × 1.54 in) in central Europe, 46.6 mm × 38.5 mm (1.83 in × 1.52 in) in Sweden (Makatsch 1976) and 47.5 mm × 39.2 mm (1.87 in × 1.54 in) in Russia.  Their occurrence in Finland is quite recent, with the species estimated to have colonized the country independently around the year 1878, and, possibly in sync with warming temperatures, tawny owls have expanded their range in other relatively northern countries like Norway, the Netherlands and Belgium.  In Lithuania, it was found that nest boxes would booster the population in openings of the forest, interiors of mature forest and even grassland but no increase was noted in young forest in a state of recovery. Generally, the Ural is more broadly adaptive to taiga and similarly conifer based forests than are tawny owls and is also somewhat more likely to be active during daylight. Across the watery vale, and shout again, It can be seen living in tree caves in forests. Size: Length 37–43 cm, wingspan 81–96 cm, weight 410–800 g. Female larger than male.  Single pairs have been known maintained territories for up to 10 years in Russia and even up to 13 year in the Berlin area. The Tawny Owl is a stocky, medium-sized owl which is common in woodlands across much of Europe.  The tawny owl's hearing may be ten times better than a human's, and it can hunt using this sense alone in the dark of a woodland on an overcast night.  Of 112 tawny owls re-released in the wild from England's East Winch Wildlife Centre, 17% were subsequently recovered (about half of which were dead), with the most diagnosed cause of mishap being road accidents. It has a rounded body and head, with a ring of dark feathers around its face surrounding the dark eyes. (1989).  Birds strongly dominated the foods of tawny owls in the Levant area, such as northern Israel, accounting for more than 70% of 229 prey items, especially Passer species. Here, among 13,359 prey items, bird constituted 35.9% with primary prey of this group being house sparrow (Passer domesticus) and European greenfinch (Chloris chloris) and that avian prey was more reliable and productive in the area than rodent prey due to the cyclic populations of the latter. 59 of 99 reduced broods were males, while 34 of 81 unmodified broods male. A similar wide-ranging generalist, the eagle owl most often nests in and around rock formations, often in fairly mountainous areas, but locally is also adaptive to varying habitats and may too nesting in old birds nests or on the ground, usually between the trunks of large trees.  Tropical species, such as the mottled owl (Strix virgata) and the African wood owl (Strix woodfordii), the latter once considered a close relative to the tawny owl, morphological differ from and have smaller outer ear areas than tawny owls. Resano, J., Hernández-Matías, A., Real, J., & Parés, F. (2011). Higher densities still were detected in the nearby Po plains. Cracovia, 23: 213–46. (2000).  Attacks only tend to occur somewhat regularly in developed areas, especially city parks, where repeated intrusions occur and perhaps resulting desensitization and irritation. Del Hoyo, J., Collar, N. J., Christie, D. A., Elliott, A., & Fishpool, L. D. C. (2014).  Larger prey items tend to be more often fed to chicks such as medium-sized birds, young rabbits and moles where available, while the parents themselves usually eat small rodents (i.e.  Studies on colour morphs also indicated that higher levels of melanin, such as darker rufous morphs, may suffer higher rates of parasitism, body mass loss through the season across all ages but on the contrary also had higher growth rates for nestlings and were more likely to breed every year than grey morphs in Italy and Switzerland regardless of prey resources than grey morphs.  Similarly, in southern Poland, they reported occur in spruce-fir dominated forests.
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