简介:In the ice-gripped environment of Alaska's Admiralty Island, summer o打造ffers the briefest of respites. Year-roun99paod res免费idents such as bears and seals turn to the salmon-filled waterways for sustenance. Meanwhile, migrants descend in droves, from humpback whales to ove强力r 140 million seabirds--almost half the bir高清ds 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.