Phylum Chordata Bateson, 1885 - chordates
   Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
     Subclass Neornithes Gadow, 1893 see Clade Neornithes Gadow, 1893
       Superorder Neognathae Pycraft, 1900 see Cohort Neognathae Pycraft, 1900
         Order Strigiformes Wagler, 1830 - owls
           Family Strigidae Vigors, 1825 - owls
             Subfamily Buboninae Vigors, 1825 - normal owls see Subfamily Striginae Vigors, 1825
               Genus Strix Linnaeus, 1758
                 Strix aluco Linnaeus, 1758 - tawny owl
                 Strix butleri (Hume, 1878) - Hume's owl
                 Strix fulvescens (Sclater & Salvin, 1868) - fulvous owl
                 Strix hylophila Temminck, 1825 - rusty-barred owl
                 Strix leptogrammica Temminck, 1832 - brown wood-owl
                 Strix nebulosa J.R. Forster, 1772 - great grey owl
                 Strix occidentalis (Xántus de Vesey, 1860) - spotted owl
                 Strix ocellata (Lesson, 1839) - mottled wood-owl
                 Strix rufipes P.P. King, 1828 - rufous-legged owl
                 Strix seloputo Horsfield, 1821 - spotted wood-owl
                 Strix uralensis Pallas, 1771 - Ural owl
                 Strix varia Barton, 1799 - barred owl
                 Strix woodfordi (Smith, 1834), nom. inval. see Strix woodfordii (A. Smith, 1834)