Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
   Subclass Neornithes Gadow, 1893 see Clade Neornithes Gadow, 1893
     Infraclass Neoaves Sibley et al., 1988 see Subcohort Neoaves Sibley et al., 1988
       Parvclass Passerae see Superorder Passerimorphae Sibley et al., 1988
         Superorder Passerimorphae Sibley et al., 1988
           Order Ciconiiformes Bonaparte, 1854
             Suborder Ciconii see Suborder Ciconiae Bonaparte, 1854
               Infraorder Ciconiides see Suborder Ciconiae Bonaparte, 1854
                 Parvorder Sulida (Reichenbach, 1849) Sibley et al., 1988
                   Superfamily Suloidea Reichenbach, 1849
                     Family Sulidae Reichenbach, 1849 - gannets, boobies
                       1 Genus Papasula Olson & Warheit, 1988
                       2 Genus Morus Vieillot, 1816
                       3 Genus Sula Brisson, 1760