Class Mammalia Linnaeus, 1758 - mammals
   Subclass Theria Parker & Haswell, 1897
     Order Lagomorpha Brandt, 1855 - lagomorphs
       Family Ochotonidae Thomas, 1897 - pikas
         Genus Ochotona Link, 1795 - pikas
           Subgenus Pika Lacépède, 1799
             Ochotona hyperborea (Pallas, 1811) - northern pika
               Ochotona hyperborea normalis (Schrenk, 1858)