Distinctions between aurochs and american bisons are not substantial .
欧洲野牛和美洲野牛的区别不明显。
Aurochs ` hair is brown , but young calves have reddish hair .
欧洲野牛的毛色是棕色的，但小牛犊的毛色略带红色。
Aurochs are the heaviest and the biggest land mammals in all european continent .
欧洲野牛是整个欧洲大陆最大也最重的哺乳动物。
The workers needed a stable food supply , and the area was rich in wild species like aurochs and einkorn , one of the ancestors of domesticated wheat .
