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Sitta tephronota Eastern Rock Nuthatch
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1st adult apparently April autumn average beetles Bergmann and Helb bill birds birds ringed Blotzheim Blue Tit brachydactyla breeding season brood brown buff caeruleus central clutches Coal Tit conifers Curio dark Dementiev and Gladkov Diptera ear-coverts east eggs especially familiaris feathers feeding Finland flank fledging flight flight-feathers flocks Flycatcher foraging forest fringes Geometridae grey Haartman habitat Haftorn Hemiptera hole Hymenoptera hypoleuca incubation inner Inozemtsev insects Iran juvenile Kazakhstan larvae Lepidoptera less Lohrl mainly mantle migration moult nest nest-boxes nest-site nestlings Noctuidae nominate non-breeding north-west northern outer pairs pale Palearctic paler Parus perch pine plumage races recorded RMNH roosting scapulars seeds sexes shorter slightly sometimes song south-west southern spiders supercilium Sweden tail tail-coverts tarsus territory tertials Thielcke tinged trees underparts upper primary coverts upperparts USSR usually variation Vaurie Voice West Germany west Palearctic wing winter Witherby woodland young ZFMK