Neornithes Gadow, 1893 - living birds
   Neognathae Pycraft 1900 see Cohort Neognathae Pycraft, 1900
     Neoaves Sibley et al. 1988 see Subcohort Neoaves Sibley et al., 1988
       [Order] Strigiformes Wagler, 1830 - owls
         Family Strigidae Vigors, 1825 - owls
           Subfamily Surniinae del Hoyo et al., 2014
             Genus Aegolius Kaup, 1829
               Aegolius acadicus (J.F. Gmelin, 1788) - saw-whet owl
                 Aegolius acadicus acadicus (Gmelin, 1788) - northern saw-whet owl