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
                   Genus Strix Linnaeus, 1758
                     01 Strix seloputo Horsfield, 1821 - spotted wood-owl
                     02 Strix ocellata (Lesson, 1839) - mottled wood-owl
                     03 Strix leptogrammica Temminck, 1832 - brown wood-owl
                     04 Strix aluco Linnaeus, 1758 - tawny owl
                     05 Strix butleri (Hume, 1878) - Hume's owl
                     06 Strix occidentalis (Xántus de Vesey, 1860) - spotted owl
                     07 Strix varia Barton, 1799 - barred owl
                     08 Strix fulvescens (Sclater & Salvin, 1868) - fulvous owl
                     09 Strix hylophila Temminck, 1825 - rusty-barred owl
                     10 Strix rufipes P.P. King, 1828 - rufous-legged owl
                     11 Strix uralensis Pallas, 1771 - Ural owl
                     12 Strix davidi (Sharpe, 1875) - Sichuan wood-owl see Strix uralensis davidi (Sharpe, 1875)
                     13 Strix nebulosa J.R. Forster, 1772 - great grey owl
                     14 Strix virgata (Cassin, 1849) - mottled owl
                     15 Strix nigrolineata (Sclater, 1859) - black-and-white owl see Ciccaba nigrolineata P.L. Sclater, 1859
                     16 Strix huhula Daudin, 1800 - black-banded owl see Ciccaba huhula (Daudin, 1800)
                     17 Strix albitarsus - rufous-banded owl see Strix albitarsis (Bonaparte, 1850)
                     18 Strix woodfordii (A. Smith, 1834) - African wood-owl