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 Picae nom. inval. see Order Picae Linnaeus, 1758 Genus Picus nom. inval. see Genus Picus Linnaeus, 1758 Picus viridis nom. inval.