depends on getting through to the ground. 取决于能否挖到地面的食物
The only thing that will keep them alive 唯一能让他们活下去的食物
and the bison are now slowly starving. 美洲野牛越来越饥饿
the prairies of North America begin to freeze. 北美的草原开始霜冻
almost continuously cropping the abundant green grass. 享用着取之不尽的大片青草
but eventually the rains will return 但是雨季终将来临
And as the sun bakes the grass, the termites face new danger. 太阳炙烤草原 白蚁面临着新的危险
A giant anteater on the plains of South America. 这是一只生活在南美平原上的大食蚁兽