The Siberian nuthatch (Sitta arctica) is a bird species of the family Sittidae. For a long time considered as a subspecies of the Eurasian nuthatch (S. europaea), it was clearly differentiated in 2006 on the basis of morphological and molecular characters. It is on average larger than the Eurasian nuthatch and also differs in some morphological features such as the shape of its bill, the size of its claws and the color of its underwing and outer rectrices. Its song has also been described as "distinctly different" from that of the Eurasian nuthatch, though without further clarification.
The Siberian nuthatch inhabits the forests northeast of Lake Baikal, up to the Bering Sea and the Sea of Okhotsk, but not near the coast. It lives in northwestern Siberia, barely exceeding the 105th meridian east in the west. It lives in larch stands and flood plains. The Siberian nuthatch has a wide range and its numbers are presumed to be stable, so the International Union for Conservation of Nature considers the bird to be of "least concern".
^BirdLife International (2017). "Sitta arctica (amended version of 2016 assessment)". IUCN Red List of Threatened Species. 2017: e.T22735379A111225641. doi:10.2305/IUCN.UK.2017-1.RLTS.T22735379A111225641.en. Retrieved 28 February 2019.title has extraneous text
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