Systema naturæ - nature Universum - universe see [unranked] Mundus Plinius naturalia - natural bodies Regnum Animale 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 Struthio-camelus Plinius, nom. inval.