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] Caprimulgiformes Ridgway, 1881 - nightjars
         Family Caprimulgidae Vigors, 1825 - nightjars
           Subfamily Caprimulginae Vigors, 1825 - nightjars
             Genus Caprimulgus Linnaeus, 1758
               Caprimulgus vociferus A. Wilson, 1812 - whip-poor-will
                 1 Caprimulgus vociferus vociferus Wilson, 1812 - eastern whip-poor-will
                 2 Caprimulgus vociferus arizonae (Brewster, 1881) - Stephens's whip-poor-will
                 3 Caprimulgus vociferus setosus van Rossem, 1934
                 4 Caprimulgus vociferus oaxacae (Nelson, 1900)
                 5 Caprimulgus vociferus chiapensis (Nelson, 1900)
                 6 Caprimulgus vociferus vermiculatus (Dickey & van Rossem, 1928)