Sentence:  The aurocks (Bos Urus or Bos primigenius) existed in Europe until fairly recently - Caesar called them Urus and Charlemagne hunted them. The Lithuanian <WSD>Zubr</WSD> (Bos Bison) is sometimes, incorrectly, called an aurock. 
Meaning of the word marked with <WSD> tags:  The wisent, the European bison ("Bison bonasus").