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
           1 Family Musophagidae Bonaparte, 1831 - turacos
           2 Family Opisthocomidae Swainson, 1837 - hoatzins
           3 Family Cuculidae Vigors, 1825 - cuckoos