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 Coraciae see Order Coraciiformes Forbes, 1884
         Superorder Galbulimorphae see Suborder Galbulae Fürbringer, 1888
           Order Galbuliformes (Vigors, 1825) see Suborder Galbulae Fürbringer, 1888
             Infraorder Bucconides see Suborder Galbulae Fürbringer, 1888
               Family Bucconidae Boie, 1826 - puffbirds
                 Genus Nonnula P.L. Sclater, 1854
                   Nonnula frontalis (P.L. Sclater, 1854) - grey-cheeked nunlet