简介:In the ice-gripped environment of Alaska's Admiralty Island, summer offe影院rs the briefest of respites. Year-round residents such as bears and seals turn to the salmon-filled waterways影院 for sustenance. Meanwhile, migrants descend in dr在线播放oves, from humpback whales to over 140 million seabirds--almeeussost half the birds in the Northern Hemisphere.详情
David Attenborough follows the remarkable story of the discovery of fossils in the Patagonia region of Argentina which prove to belong to the largest animal to ever walk the Earth.