[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Tetrapoda Hatschek & Cori 1896 [Gauthier, Kluge & Rowe 1988]
     Order Cetacea Brisson, 1762 - whales, dolphins, and porpoises see Infraorder Cetacea Brisson, 1762
       Family Eschrichtiidae Ellerman & Morrison-Scott, 1951 - gray whales
         Genus Eschrichtius Gray, 1864 - gray whale
           1 Eschrichtius robustus (Lilljeborg, 1861) - gray whale