The nuthatches constitute a genus " Sitta " of small passerine birds belonging to the nominate subspecies, " Sitta leucopsis ", and the white-breasted nuthatch ( " Sitta carolinensis " ).
2.
The white-cheeked nuthatch, with " S . przewalskii " subsumed within it, has been regarded as closely related to the North American white-breasted nuthatch ( " Sitta carolinensis " ), which has a similar contact call ( though " S . carolinensiss " s is moderately higher in pitch ), and they have sometimes been treated as conspecific.
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