Imperium naturæ C. Linnaeus, 1758 - nature
   Mundus Plinius - physical world
     naturalia - natural bodies
       Regnum Animale C. Linnaeus, 1758 - animal kingdom see Kingdom Animalia Linnaeus, 1758
         Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
           Order Accipitres Linnaeus, 1758 see Suborder Accipitres (C. Linnaeus, 1758)
             Genus Strix Linnaeus, 1758
               01 Strix bubo Linnaeus, 1758 see Bubo bubo (C. Linnaeus, 1758)
               02 Strix scandiaca Linnaeus, 1758 see Nyctea scandiaca (C. Linnaeus, 1758)
               03 Strix asio Linnaeus, 1758 see Otus asio (C. Linnaeus, 1758)
               04 Strix otus Linnaeus, 1758 see Asio otus (C. Linnaeus, 1758)
               05 Strix scops Linnaeus, 1758 see Otus scops (C. Linnaeus, 1758)
               06 Strix aluco Linnaeus, 1758 - tawny owl
               07 Strix funerea Linnaeus, 1758 see Aegolius funereus (C. Linnaeus, 1758)
               08 Strix nyctea Linnaeus, 1758
               09 Strix stridula Linnaeus, 1758
               10 Strix ulula Linnaeus, 1758 see Surnia ulula (C. Linnaeus, 1758)
               11 Strix passerina Linnaeus, 1758 see Glaucidium passerinum (C. Linnaeus, 1758)