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 Columbiformes Latham, 1790 - pigeons and allies
             Family Columbidae Illiger, 1811 - doves, pigeons
               Genus Ducula Hodgson, 1836
                 01 Ducula poliocephala (Gray, 1844) - pink-bellied imperial-pigeon
                 02 Ducula forsteni (Bonaparte, 1854) - white-bellied imperial-pigeon
                 03 Ducula mindorensis (Whitehead, 1896) - Mindoro imperial-pigeon
                 04 Ducula radiata (Quoy & Gaimard, 1830) - grey-headed imperial-pigeon
                 05 Ducula carola (Bonaparte, 1854) - spotted imperial-pigeon
                 06 Ducula aenea (Linnaeus, 1766) - green imperial-pigeon
                 07 Ducula perspicillata (Temminck, 1824) - white-eyed imperial-pigeon
                 08 Ducula concinna (Wallace, 1865) - elegant imperial-pigeon
                 09 Ducula pacifica (Gmelin, 1789) - Pacific imperial-pigeon
                 10 Ducula oceanica (Lesson & Garnot, 1826) - Micronesian imperial-pigeon
                 11 Ducula aurorae (Peale, 1848) - Polynesian imperial-pigeon
                 12 Ducula galeata (Bonaparte, 1855) - Marquesan imperial-pigeon
                 13 Ducula rubricera (Bonaparte, 1854) - red-knobbed imperial-pigeon
                 14 Ducula myristicivora (Scopoli, 1786) - spice imperial-pigeon
                 15 Ducula pistrinaria Bonaparte, 1855 - island imperial-pigeon
                 16 Ducula whartoni (Sharpe, 1887) - Christmas Island imperial-pigeon
                 17 Ducula rosacea (Temminck, 1836) - pink-headed imperial-pigeon
                 18 Ducula pickeringii (Cassin, 1854) - grey imperial-pigeon
                 19 Ducula basilica Bonaparte, 1854 - cinnamon-bellied imperial-pigeon
                 20 Ducula rufigaster (Quoy & Gaimard, 1830) - purple-tailed imperial-pigeon
                 21 Ducula finschii (Ramsay, 1882) - Finsch's imperial-pigeon
                 22 Ducula chalconota (Salvadori, 1874) - shining imperial-pigeon
                 23 Ducula latrans (Peale, 1848) - Peale's imperial-pigeon
                 24 Ducula brenchleyi (Gray, 1870) - chestnut-bellied imperial-pigeon
                 25 Ducula bakeri (Kinnear, 1928) - Baker's imperial-pigeon
                 26 Ducula goliath (Gray, 1859) - New Caledonian imperial-pigeon
                 27 Ducula pinon (Quoy & Gaimard, 1824) - Pinon imperial-pigeon
                 28 Ducula melanochroa (Sclater, 1878) - Bismarck imperial-pigeon
                 29 Ducula mullerii (Temminck, 1835) - collared imperial-pigeon
                 30 Ducula zoeae (Lesson, 1826) - banded imperial-pigeon
                 31 Ducula badia (Raffles, 1822) - mountain imperial-pigeon
                 32 Ducula lacernulata (Temminck, 1822) - dark-backed imperial-pigeon
                 33 Ducula cineracea (Temminck, 1835) - Timor imperial-pigeon
                 34 Ducula bicolor (Scopoli, 1786) - pied imperial-pigeon
                 35 Ducula luctuosa (Temminck, 1825) - white imperial-pigeon see Ducula bicolor luctuosa (Temminck, 1824)
                 36 Ducula spilorrhoa (Gray, 1858) - Torresian imperial-pigeon see Ducula bicolor spilorrhoa (Gray, 1858)
                 37 Ducula constans Bruce, 1989 - Kimberley imperial-pigeon see Ducula bicolor spilorrhoa (Gray, 1858)
                 38 Ducula subflavescens (Finsch, 1886) - yellow-tinted imperial-pigeon see Ducula bicolor subflavescens (Finsch, 1886)