Seasonal Forests: The Taiga forest, on the edge of the Arctic, is a silent world of stunted conifers.The trees may be small but filming from the air reveals its true scale.

• 在这一集里,你将看到30吨重的鲸鲨如何吃掉全部的鱼,将从一个特别的高视角展示海豚是如何提速的。