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 Passeres Linnaeus, 1758 see Suborder Passeres (C. Linnaeus, 1758) C. Linnaeus, 1766
             Genus Caprimulgus Linnaeus, 1758
               1 Caprimulgus europaeus Linnaeus, 1758 - Eurasian nightjar
               2 Caprimulgus americanus Linnaeus, 1758 see Siphonorhis americana (Linnaeus, 1758)