Lake Superior Zoo in Minnesota announced it has given a brown bear the world's largest dental crown, with the bear now ...

先来点背景知识。Tundra（直译为苔原），现年6岁，362公斤，站立时2.43米高，是一只典型的阿拉斯加棕熊（Ursus arctos）。这头名为 Tundra ...