Sentence:  It is not improbable that the Bison mentioned by Seneca and Pliny was the Bonasus of Aristotle, and the <WSD>Zubr</WSD> and Auerochs of the moderns, while the Urus of these writers seems to be now extinct as a wild animal, but was perhaps the original of our present domestic cattle.  Bojanus, however, is of a different opinion. 
Meaning of the word marked with <WSD> tags:  One of several species of European bison or aurochs, which were unclearly delineated in the 1800s when this sense was in use. (from the 1820s onwards)