Dov, A.B., Atar, A., Baruchi, E, Levi, K. & Sapir, N. (2017). However, some variation in wing moult accounts for mistaken identification by age of 3 year old owls for younger ages due to the fact that they retain some worn juvenile wing feathers. [187][237][238][239] Rodent prey may range up to the size of probable juveniles of the non-native nutria (Myocastor coypus). Die Eier der Vögel Europas. [6][257] When a population of great (Parus major) and Eurasian blue tits (Cyanistes caeruleus) was artificially increased by researchers in the vicinity of tawny owl nests, it was found that, despite the tits not being common food, the owls did reduce the population of increased tit. Sunde, P., Forsom, H. M., Al-Sabi, M. N. S., & Overskaug, K. (2012).

Unlike some owls such as long-eared owls they do not seem to disdain these musky-tasting and slight insectivores. (1980, January). Balčiauskienė, L., & Dementavičius, D. (2006).

This species is found through much of Iberian Peninsula, though spotty distribution here, with the largest gap where absent being in southeastern Spain (where still not completely absent). [298] Reports of tawny owls killing common buzzards and northern goshawks are of nebulous detail and may refer in fact to nighttime nest robberies rather than overpowering adults of these larger, dangerous and often seemingly avoided raptors. (1993). In the latter type of hunts, the tawny owls may strike branches and/or beat their wings together in front of denser foliage, bushes or conifers in order to disturb and flush prey such as small birds and bats, or may dive directly into said foliage. [213][262] The urbanization effect was particularly strongly noted in England, where birds constituted only about 4% of the foods in the countryside per two studies, but in Wythenshawe part of Manchester and Holland Park in London, birds made up 89% and 93% of the foods, respectively.

[4] Boundary disputes frequently cause males to utter a wett wett, weck weck weck or gweck gweck gweck call, while females do a significantly less deep-sounding version of this. [203] Wild mice, bank voles and, to a more pronounced extent, Microtus voles undergo population cycles over a three-year (or sometimes four-year) span, which frequently requires the owls to alternate their foods when populations decline. [4] They at times will make use of manmade perches in suburban areas, such as utility poles, peaked roofs, chimney pots, tall fences, billboards or television antenna by dusk, while during the day they often tuck away in hollies, evergreens, oaks and/or thick ivy. [190] Individual dietary studies show that the mean prey mass taken by tawny owls can vary from 12.6 to 130 g (0.44 to 4.59 oz) depending on prey access.

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