第 1 季，第 4 集: This is the planet's most extreme wilderness. Here in the Arctic, creatures carve out a grueling existence amongst vast snow-forests and the brutal tundra. During winter, the Arctic Ocean locks these lands in ice and 24 hours of night, but summer brings around the clock sun, and the ocean and its islands burst into life attracting animals from all over the globe, for a summer feeding frenzy.
Documentary · 2013年8月20日 · 43 分鐘