Steelhead populations in rivers along the US west coast are listed as threatened or endangered by the US Fish and wildlife service. 美国西海岸河流的虹鳟族群被美国渔业局和野生生命部门列为受到威胁和遭到危险的族群。
In january, the US Fish and Wildlife Service proposed listing the polar bear as a threatened species under the endangered species act, noting polar bears depended on sea ice as a platform to hunt seals, their main prey. 今年1月,美国鱼类及野生动物保护局提议将北极熊列入《濒危物种法案》的濒危物种名单,并指出北极熊主要依靠海冰这一“平台”来捕食海豹。