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 Otus Pennant, 1769
                     01 Otus sagittatus (Cassin, 1848) - white-fronted scops-owl
                     02 Otus rufescens (Horsfield, 1821) - reddish scops-owl
                     03 Otus icterorhynchus (Shelley, 1873) - sandy scops-owl
                     04 Otus ireneae Ripley, 1966 - Sokoke scops-owl
                     05 Otus balli (Hume, 1873) - Andaman scops-owl
                     06 Otus spilocephalus (Blyth, 1846) - mountain scops-owl
                     07 Otus umbra (Richmond, 1903) - Simeulue scops-owl
                     08 Otus angelinae (Finsch, 1912) - Javan scops-owl
                     09 Otus manadensis (Quoy & Gaimard, 1830) - Sulawesi scops-owl
                     10 Otus longicornis (Ogilvie-Grant, 1894) - Luzon scops-owl
                     11 Otus mindorensis (J. Whitehead, 1899) - Mindoro scops-owl
                     12 Otus mirus Ripley & Rabor, 1968 - Mindanao scops-owl
                     13 Otus hartlaubi (Giebel, 1872) - Sao Tome scops-owl
                     14 Otus brucei (Hume, 1872) - pallid scops-owl
                     15 Otus flammeolus (Kaup, 1853) - flammulated owl
                     16 Otus scops (C. Linnaeus, 1758) - common scops-owl
                     17 Otus elegans (Cassin, 1852) - elegant scops-owl
                     18 Otus mantananensis (Sharpe, 1892) - Mantanani scops-owl
                     19 Otus magicus (S. Müller, 1841) - Moluccan scops-owl
                     20 Otus rutilus (Pucheran, 1849) - Malagasy scops-owl
                     21 Otus pauliani Benson, 1960 - Comoro scops-owl
                     22 Otus brookii (Sharpe, 1892) - rajah scops-owl
                     23 Otus bakkamoena Pennant, 1769 - collared scops-owl
                     24 Otus mentawi Chasen & Kloss, 1926 - Mentawai scops-owl
                     25 Otus fuliginosus (Sharpe, 1888) - Palawan scops-owl
                     26 Otus megalotis (Walden, 1875) - Philippine scops-owl
                     27 Otus silvicola (Wallace, 1864) - Wallace's scops-owl
                     28 Otus leucotis (Temminck, 1820) - white-faced scops-owl see Ptilopsis leucotis (Temminck, 1820)
                     29 Otus kennicottii (Elliot, 1867) - western screech-owl
                     30 Otus asio (C. Linnaeus, 1758) - eastern screech-owl
                     31 Otus trichopsis (Wagler, 1832) - whiskered screech-owl
                     32 Otus choliba (Vieillot, 1817) - tropical screech-owl
                     33 Otus koepckeae Hekstra, 1982 - Koepcke's screech-owl
                     34 Otus roboratus Bangs & Noble, 1918 - West Peruvian screech-owl
                     35 Otus clarkii L. Kelso & E.H. Kelso, 1935 - bare-shanked screech-owl
                     36 Otus barbarus (Sclater & Salvin, 1868) - Santa Barbara screech-owl
                     37 Otus ingens (Salvin, 1897) - rufescent screech-owl
                     38 Otus marshalli Weske & Terborgh, 1981 - cloud-forest screech-owl
                     39 Otus watsonii (Cassin, 1848) - tawny-bellied screech-owl
                     40 Otus atricapillus (Temminck, 1822) - variable screech-owl see Otus atricapilla (Temminck, 1822)
                     41 Otus vermiculatus (Ridgway, 1887) - vermiculated screech-owl
                     42 Otus sanctaecatarinae (Salvin, 1897) - long-tufted screech-owl
                     43 Otus lawrencii (Sclater & Salvin, 1868) - bare-legged owl see Gymnoglaux lawrencii Sclater & Salvin, 1868
                     44 Otus nudipes (Daudin, 1800) - Puerto Rican screech-owl
                     45 Otus podarginus (Hartlaub & Finsch, 1872) - Palau owl see Pyrroglaux podargina (Hartlaub & Finsch, 1872)
                     46 Otus albogularis (Cassin, 1849) - white-throated screech-owl