Neornithes Gadow, 1893 - living birds
   Neognathae Pycraft 1900 see Cohort Neognathae Pycraft, 1900
     Neoaves Sibley et al. 1988 see Subcohort Neoaves Sibley et al., 1988
       [Order] Passeriformes Linnaeus, 1758
         oscines see Suborder Oscines
           Passerida - passeridans see Parvorder Passerida (C. Linnaeus, 1758) Sibley et al., 1988
             Passeroidea
               Family Emberizidae Vigors, 1825 - buntings, American sparrows and allies
                 Subfamily Emberizinae see Family Emberizidae Vigors, 1825
                   Genus Pipilo Vieillot, 1816
                     1 Pipilo chlorurus (Audubon, 1839) - green-tailed towhee
                     2 Pipilo ocai (Lawrence, 1865)
                     3 Pipilo maculatus Swainson, 1827
                     4 Pipilo erythrophthalmus (C. Linnaeus, 1758) - rufous-sided towhee
                     5 Pipilo albicollis P.L. Sclater, 1858
                     6 Pipilo fuscus Swainson, 1827 - brown towhee
                     7 Pipilo crissalis (Vigors, 1839)
                     8 Pipilo aberti S.F. Baird, 1852 - Abert's towhee