简介:In the ice-gripped environment of Alaska's Admiralty Island, summer offers the briefest of respites. Year-round resi视频dents such as bears and seals turn to the salmon-filled waterways for sustenance. Meanwh中文ile, migrants descend in droves, from humpback w最近hales to over 140 million seabirds--almost half the birds in 在线the Northern Hemisphere.详情