for the coldest, most precipitous nursery on Earth. 地球上最寒冷、最陡峭的养育场所
what are now India and Asia collided on an epic scale. 如今的印度和亚洲 以极大的规模碰撞在一起
others evolved to feed on the grazers. 另一些哺乳动物 则进化为以食草动物为食
But just as some mammals evolved to feed on the grass, 但在一些哺乳动物 进化成以草为食的同时
The asteroid had inflicted devastating losses on the mammals... 小行星碰撞 对哺乳动物造成毁灭性的打击
In the four billion years of life on our planet, 地球生命的40亿年历程中
restricted to feeding on low-energy kelp... 只能以低能量的海藻为食
now some of the most incredible gatherings of life on Earth. 其中有一些如今成为 地球上最不可思议的生命聚集