The National Parks Service and U.S. Fish & Wildlife Service filed a decision April 25 outlining a plan to capture three to seven grizzlies from other ecosystems in the Rocky Mountains or interior British Columbia and release them in the North Cascades each summer for five to 10 years. The goal is to rebuild a population of 200 bears in a century. In the Lower 48 states, the bears are a threatened species under the federal Endangered Species Act.