Imperium naturae C. Linnaeus, 1758 - nature
   Regnum Animale C. Linnaeus, 1758 - animal kingdom see Kingdom Animalia Linnaeus, 1758
     1 Class Mammalia Linnaeus, 1758 - mammals
     2 Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
     3 Class Amphibia Linnaeus, 1758 - amphibians see Class Amphibia Gray, 1825
     4 Class Pisces Linnaeus, 1758 see Superclass Pisces Linnaeus, 1758