A critical analysis of the literature regarding Sitta villosa and the examination of specimens has shown that the range of this species is divisible into three main areas. These are well separated and each population is best treated as a valid subspecies, although for corea, the easternmost population, further research is needed to understand the distinctions between two apparently disjunct populations.

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Zoologische Mededelingen

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Naturalis journals & series

Nazarenko, A. A. (2006). Systematic Notes on Asian Birds. 64. The range of the Chinese Nuthatch Sitta villosa and an evaluation of subspecies validity. Zoologische Mededelingen, 80(5), 265–271.