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 Regulidae Vigors, 1825
                     Genus Regulus Cuvier, 1800
                       1 Regulus calendula (C. Linnaeus, 1766) - ruby-crowned kinglet
                       2 Regulus regulus (C. Linnaeus, 1758)
                       3 Regulus teneriffae Seebohm, 1883 see Regulus regulus teneriffae Seebohm, 1883
                       4 Regulus goodfellowi Ogilvie-Grant, 1906
                       5 Regulus ignicapillus (Temminck, 1820) see Regulus ignicapilla (Temminck, 1820)
                       6 Regulus satrapa M.H.K. Lichtenstein, 1823 - golden-crowned kinglet