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 Muscicapoidea
                   Family Muscicapidae Fleming, 1822 - chats and Old World flycatchers
                     Subfamily Turdinae see Family Turdidae Rafinesque, 1815
                       Genus Catharus Bonaparte, 1850
                         Catharus occidentalis P.L. Sclater, 1859
                           Catharus occidentalis olivascens Nelson, 1899