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 the salmon-filled waterway精品s for sustenance. Meanwhil免费e, migrants descend in drov99re8es, from humpback whales to over 在线140 million seabirds--almost half the birds in the Northern Hemisphere.视频详情