- wisent, aurochs, Bison bonasus - European bison having a smaller and higher head than the North American bison
--1 is a kind of bison
--1 is a member of genus Bison - aurochs, urus, Bos primigenius - large recently extinct long-horned European wild ox; considered one of the ancestors of domestic cattle
--2 is a kind of ox, wild ox
--2 is a member of Bos, genus Bos