简介:In the ice-gripped environment of Alaska's Admiralty Island, summer offers the briefest of respites. Year-round residents such as bears and seals turn to thfreexxxe salmon-filled waterways for sustenance. Meanwhile, migrants descend in droves, from humpback whales to over 140 million seabirds--almost half the birds in the Northe欧美rn 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.