简介:In the ice-gripped env机机ironment of Alaska's Admiralty Island, summer offers the briefest 免费下载of机机 respites. Year-round residents such as bear手机s and seals turn to the salmon-filled waterways for sustenance. Meanwhile, migrants descend in droves, from humpback whales to over 140 million seabirds--almost half the birds in the Northern Hemisphere.详情