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 "Gallinae" nom. inval.] see Order Gallinae Linnaeus, 1758 [Genus "Struthio" nom. inval.] see Genus Struthio Linnaeus, 1758 1 "Struthio-camelus" Plinius, nom. inval.