This summer, government officials have killed about 150 cormorants nesting on an island in the Columbia River. They're using rifles with silencers under the cover of night. It's part of a plan that aims to protect salmon from these avian predators. Scientists say the birds are eating up to 18 percent of juvenile salmon. But opponents argue killing the birds won't actually help the fish. Cassandra Profita went onto the river to find out more.