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 Passeriformes Linnaeus, 1758
             Suborder Passeri see Suborder Passeres (C. Linnaeus, 1758) C. Linnaeus, 1766
               Parvorder Passerida (C. Linnaeus, 1758) Sibley et al., 1988
                 Superfamily Sylvioidea
                   Family Pycnonotidae Gray, 1840 - bulbuls
                     Genus Pycnonotus Boie, 1826
                       01 Pycnonotus zeylanicus (J.F. Gmelin, 1789)
                       02 Pycnonotus striatus (Blyth, 1842)
                       03 Pycnonotus leucogrammicus (S. Müller, 1836)
                       04 Pycnonotus tympanistrigus (S. Müller, 1836)
                       05 Pycnonotus melanoleucus see Pycnonotus melanoleucos (Eyton, 1839)
                       06 Pycnonotus priocephalus (Jerdon, 1839)
                       07 Pycnonotus atriceps (Temminck, 1822)
                       08 Pycnonotus melanicterus (J.F. Gmelin, 1789)
                       09 Pycnonotus squamatus (Temminck, 1828)
                       10 Pycnonotus cyaniventris Blyth, 1842
                       11 Pycnonotus jocosus (C. Linnaeus, 1758) - red-whiskered bulbul
                       12 Pycnonotus xanthorrhous Anderson, 1869
                       13 Pycnonotus sinensis (J.F. Gmelin, 1789)
                       14 Pycnonotus taivanus Styan, 1893
                       15 Pycnonotus barbatus (Desfontaines, 1789)
                       16 Pycnonotus somaliensis Reichenow, 1905 see Pycnonotus barbatus somaliensis
                       17 Pycnonotus dodsoni Sharpe, 1895 see Pycnonotus barbatus dodsoni
                       18 Pycnonotus tricolor (Hartlaub, 1862) see Pycnonotus barbatus tricolor
                       19 Pycnonotus nigricans (Vieillot, 1818)
                       20 Pycnonotus capensis (C. Linnaeus, 1766)
                       21 Pycnonotus xanthopygos (Hemprich & Ehrenberg, 1833) - yellow-vented bulbul
                       22 Pycnonotus leucotis (Gould, 1836) see Pycnonotus leucogenys leucotis
                       23 Pycnonotus leucogenys (J.E. Gray, 1835)
                       24 Pycnonotus cafer (C. Linnaeus, 1766) - red-vented bulbul
                       25 Pycnonotus aurigaster (Vieillot, 1818)
                       26 Pycnonotus eutilotus (Jardine & Selby, 1837)
                       27 Pycnonotus nieuwenhuisii (Finsch, 1901)
                       28 Pycnonotus urostictus (Salvadori, 1870)
                       29 Pycnonotus bimaculatus (Horsfield, 1821)
                       30 Pycnonotus finlaysoni Strickland, 1844
                       31 Pycnonotus xantholaemus (Jerdon, 1845)
                       32 Pycnonotus penicillatus Blyth, 1851
                       33 Pycnonotus flavescens Blyth, 1845
                       34 Pycnonotus luteolus (Lesson, 1841)
                       35 Pycnonotus goiavier (Scopoli, 1786)
                       36 Pycnonotus plumosus Blyth, 1845
                       37 Pycnonotus blanfordi Jerdon, 1862
                       38 Pycnonotus simplex Lesson, 1839
                       39 Pycnonotus brunneus Blyth, 1845
                       40 Pycnonotus erythropthalmos (Hume, 1878)