Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
   Subclass Neornithes Gadow, 1893 see Clade Neornithes Gadow, 1893
     Infraclass Neoaves Sibley et al., 1988 see Subcohort Neoaves Sibley et al., 1988
       Parvclass Passerae see Superorder Passerimorphae Sibley et al., 1988
         Superorder Passerimorphae Sibley et al., 1988
           Order Passeriformes Linnaeus, 1758
             Suborder Passeri see Suborder Passeres (C. Linnaeus, 1758) C. Linnaeus, 1766
               Parvorder Passerida (C. Linnaeus, 1758) Sibley et al., 1988
                 Superfamily Sylvioidea
                   Family Sittidae Lesson, 1828 - nuthatches and wallcreeper
                     Subfamily Sittinae
                       Genus Sitta Linnaeus, 1758
                         Sitta europaea Linnaeus, 1758
                           1 Sitta europaea caesia Wolf, 1810
                           2 Sitta europaea europaeaᵀ Linnaeus, 1758
                           3 Sitta europaea sinensis J. Verreaux, 1870