Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
   Neornithes Gadow, 1893 see Clade Neornithes Gadow, 1893
     Neoaves Sibley et al., 1988 see Subcohort Neoaves Sibley et al., 1988
       Passerae see Superorder Passerimorphae Sibley et al., 1988
         Passerimorphae Sibley et al., 1988
           Passeriformes Linnaeus, 1758
             Passeri see Suborder Passeres (C. Linnaeus, 1758) C. Linnaeus, 1766
               Passerida (C. Linnaeus, 1758) Sibley et al., 1988
                 Passeroidea
                   Passeridae Rafinesque, 1815 - sparrows, snowfinches and allies
                     Motacillinae Bonaparte, 1831 see Family Motacillidae Horsfield, 1821
                       Motacilla Linnaeus, 1758
                         Motacilla flava Linnaeus, 1758 - yellow wagtail
                           Motacilla flava thunbergi Billberg, 1828