tokens: It is a long-lived , stocky fish like its relatives the bigmouth buffalo ( `` I. cyprinellus `` ) and the black buffalo ( `` I. niger `` ) , although the smallmouth buffalo 's mouth is located ventrally like other Catostomidae species , while the bigmouth buffalo 's mouth is terminal and opens forward , and the smallmouth buffalo 's eyes are significantly larger than those of the black buffalo .