Natura - nature actualia - actual entities Mundus Plinius - physical world naturalia - natural bodies ["Animale Regnum" nom. inval. - animal kingdom] see Kingdom Animalia Linnaeus, 1758 [Class "Aves" Plinius, nom. inval. - birds] see Class Aves Linnaeus, 1758 [Order "Macrorhynchae" nom. inval.] see Order Grallae Linnaeus, 1758 1 [Genus "Grus" nom. inval.] see Genus Ardea Linnaeus, 1758 2 [Genus "Ciconia" nom. inval.] see Genus Ardea Linnaeus, 1758