Neornithes Gadow, 1893 - living birds
   Neognathae Pycraft 1900 see Cohort Neognathae Pycraft, 1900
     Neoaves Sibley et al. 1988 see Subcohort Neoaves Sibley et al., 1988
       [Order] Passeriformes Linnaeus, 1758
         oscines see Suborder Oscines
           "Corvida" - corvidans see Parvorder Corvida Sibley et al., 1988
             Family Corvidae Vigors, 1825 - crows, jays
               Genus Nucifraga Brisson, 1760
                 1 Nucifraga columbiana (A. Wilson, 1811) - Clark's nutcracker
                 2 Nucifraga caryocatactes (C. Linnaeus, 1758)