Neornithes Gadow, 1893 - living birds
   Neognathae Pycraft 1900 see Cohort Neognathae Pycraft, 1900
     Galloanserae Sibley, Ahlquist & Monroe Jr., 1988 see Subcohort Galloanserae Sibley, Ahlquist & Monroe Jr., 1988
       [Order] Galliformes Temminck, 1820 - fowl
         phasianoids see Superfamily Phasianoidea Vigors, 1825
           Family Phasianidae Vigors, 1825 - turkeys, grouse, pheasants, partridges
             Subfamily Tetraoninae Vigors - grouse see Family Tetraonidae Vigors, 1825
               Genus Lagopus Brisson, 1760 - ptarmigan
                 Lagopus leucura (Richardson, 1831) - white-tailed ptarmigan
                   1 Lagopus leucura peninsularis Chapman, 1902
                   2 Lagopus leucura leucuraᵀ (Richardson, 1831)
                   3 Lagopus leucura rainierensis Taylor, 1920
                   4 Lagopus leucura saxatilis Cowan, 1939
                   5 Lagopus leucura altipetens Osgood, 1901