Kingdom [Animalia] Linnaeus, 1758 - animals
   Subkingdom Metazoa Haeckel, 1874 see Kingdom Animalia Linnaeus, 1758
     Division Eumetazoa Butschli, 1910 see Subkingdom Eumetazoa Butschli, 1910
       Subdivision Bilateralia
         Phylum Chordata Bateson, 1885 - chordates
           Subphylum Vertebrata Cuvier, 1812 - vertebrates
             Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
               Subclass Neornithes Gadow, 1893 see Clade Neornithes Gadow, 1893
                 Order Strigiformes Wagler, 1830 - owls
                   Family Strigidae Vigors, 1825 - owls
                     Subfamily Striginae Vigors, 1825 - strange-eared owls
                       Genus Aegolius Kaup, 1829
                         1 Aegolius funereus (C. Linnaeus, 1758) - boreal owl
                         2 Aegolius acadicus (J.F. Gmelin, 1788) - saw-whet owl
                         3 Aegolius ridgwayi (Alfaro, 1905)
                         4 Aegolius harrisii (Cassin, 1849) - buff-fronted owl