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 Strigimorphae see Superorder Falconimorphae Seebohm, 1890
           Order Strigiformes Wagler, 1830 - owls
             Suborder Strigi see Order Strigiformes Wagler, 1830
               Parvorder Strigida see Order Strigiformes Wagler, 1830
                 Family Strigidae Vigors, 1825 - owls
                   01 Genus Otus Pennant, 1769
                   02 Genus Mimizuku Hachisuka, 1934
                   03 Genus Bubo Duméril, 1806
                   04 Genus Ketupa Lesson, 1830
                   05 Genus Scotopelia Bonaparte, 1850
                   06 Genus Nyctea Stephens, 1826
                   07 Genus Strix Linnaeus, 1758
                   08 Genus Jubula Bates, 1929
                   09 Genus Lophostrix Lesson, 1836
                   10 Genus Pulsatrix Kaup, 1848
                   11 Genus Surnia Duméril, 1805
                   12 Genus Glaucidium Boie, 1826
                   13 Genus Xenoglaux O'Neill & Graves, 1977
                   14 Genus Micrathene Coues, 1866
                   15 Genus Athene Boie, 1822
                   16 Genus Speotyto Gloger, 1841 see Genus Athene Boie, 1822
                   17 Genus Aegolius Kaup, 1829
                   18 Genus Ninox Hodgson, 1837
                   19 Genus Uroglaux Mayr, 1937
                   20 Genus ‡Sceloglaux Kaup, 1848
                   21 Genus Pseudoscops Kaup, 1848
                   22 Genus Asio Brisson, 1760
                   23 Genus Nesasio J.L. Peters, 1937