Phylum Chordata Bateson, 1885 - chordates
   Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
     Subclass Neornithes Gadow, 1893 see Clade Neornithes Gadow, 1893
       Superorder Neognathae Pycraft, 1900 see Cohort Neognathae Pycraft, 1900
         Order Cuculiformes Wagler, 1830 - cuckoos and plantain-eaters
           Family Cuculidae Vigors, 1825 - cuckoos
             Subfamily Cuculinae Vigors, 1825
               Genus Cuculus Linnaeus, 1758
                 Cuculus canorus Linnaeus, 1758 - common cuckoo
                 Cuculus castaneiventris see Cacomantis castaneiventris (Gould, 1867)
                 Cuculus clamosus Latham, 1802 - black cuckoo
                 Cuculus crassirostris (Walden, 1872) - Sulawesi hawk-cuckoo
                 Cuculus fugax Horsfield, 1821 - Hodgson's hawk-cuckoo
                 Cuculus gularis Stephens, 1815 - African cuckoo
                 Cuculus heinrichi see Cacomantis heinrichi Stresemann, 1931
                 Cuculus merulinus see Cacomantis merulinus (Scopoli, 1786)
                 Cuculus micropterus Gould, 1837[1838] - Indian cuckoo
                 Cuculus pallidus (Latham, 1802) - pallid cuckoo
                 Cuculus poliocephalus Latham, 1790 - lesser cuckoo
                 Cuculus pyrrhophanus see Cacomantis flabelliformis pyrrophanus (Vieillot, 1817)
                 Cuculus rochii Hartlaub, 1863 - Madagascar cuckoo
                 Cuculus saturatus Blyth, 1843 - Oriental cuckoo
                 Cuculus sepulcralis see Cacomantis sepulcralis Muller, 1843
                 Cuculus solitarius Stephens, 1815 - red-chested cuckoo
                 Cuculus sonneratii see Cacomantis sonneratii (Latham, 1790)
                 Cuculus sparverioides Vigors, 1832 - large hawk-cuckoo
                 Cuculus vagans S. Müller, 1845 - moustached hawk-cuckoo
                 Cuculus variolosus see Cacomantis variolosus (Vigors & Horsfield, 1827)
                 Cuculus varius Vahl, 1797 - common hawk-cuckoo