The survival of one owl species hinges on the demise of another. That’s what the U.S. Fish and Wildlife Service argues in its proposal to allow the agency to shoot hundreds of thousands of barred owls over the next 30 years in West Coast forests. The service says the barred owl, which is not native to the region, is crowding out the spotted owl, a close genetic relative. Without action against the barred owls, service biologists say the spotted owl could disappear from parts of Washington and Oregon within a few years and eventually go extinct.