With their large, sharp horns, bison are formidable foes. During mating season, bulls fight for the right to breed with harems of cows, but rarely duel to the death.

• 拥有庞大身躯和锋利牛角的北美野牛是一个可怕的对手。在交配季节，雄性野牛为了夺得与一群雌性野牛的交配权利而相互打斗，但一般来说都不是致命的决斗。