简介:In the ice-gripped environment of Alaska's Admiralty Island,日韩高清 summer offers the briefest of respites. Year-round residents such as bears and seals turn to the salmon-filled w秋霞aterways for sustenance. Meanwhile, migrants descend in droves, from humpback whales to over 140理论 million seabirds--almost half the birds 在线观看in the Northern Hemisphere.详情
David Attenborough explores the rise of life on our planet, from the explosion of first life on seabeds hundreds of millions of years ago to life today.