The name of an extinct species of wild ox (Bos primigenius), the ancestor of present-day domestic cattle, which became extinct in the 17th century AD. It was described by Caesar as Urus and it inhabited Europe and the British Isles in ancient times and survived in most recent times in Lithuania, Poland, and Prussia. The name has often been applied erroneously to another species, the European bison, which still exists in the Lithuania forests. It was probably domesticated in some places, such as in eastern Hungary during the 4th millennium BC.