The term 'European Ox' refers to four different species of large, wild cattle that are native to Europe. The first species is the Auroch (6 letters), which is an extinct species of wild cattle that lived in Europe, Asia, and North Africa until the 17th century. The second species is the BISON (5 letters), which is a species of large, wild cattle that still lives in parts of Europe and North America. The third species is the AUROCHS (7 letters), which is a species of wild cattle that is closely related to the Auroch and is still found in parts of Europe. The fourth species is the URUS (4 letters), which is a species of wild cattle that is closely related to the Auroch and is found in parts of Europe and Asia.