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 harrisii (Cassin, 1849) - buff-fronted owl
                 1 Aegolius harrisii harrisii (Cassin, 1849)
                 2 Aegolius harrisii iheringi (Sharpe, 1899)
                 3 Aegolius harrisii dabbenei Olrog, 1979