当1973年《濒危物种法案》签署时，人们期望它能保护一批引人注目的动物，如秃头鹰和黄石公园的北美灰熊。
When the Endangered Species Act was signed in 1973, it was expected to protect charismatic fauna such as the bald eagle and Yellowstone's grizzly bears.
本系列将介绍凯西安德森的故事，他贡献一己之力保护野生动物，并以大胆的方式来瞭解北美灰熊的一举一动。
Expedition Wild presents the unique story of Casey Anderson, a man who has dedicated himself to wildlife preservation and a daring approach to understanding grizzlies every move.
欧文斯夫妇参加了爱达荷州赞助支持的，为该地区少数幸存的北美洲灰熊诱捕并附加标签的活动。
The Owenses became involved in a state-sponsored effort to trap and tag the region's few remaining grizzlies.
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