Struggling orca whales need even urban chinook to survive, new findings show.

A new look at just where orcas are eating big kings reveals the importance of rivers in north and south Puget Sound to the orcas’ survival. Even the Puyallup, Green and Duwamish rivers count for the top predators.

The Nooksack, Elwha, Dungeness, Skagit, Stillaguamish and Snohomish to the north and Nisqually, Puyallup, Green, Duwamish, Deschutes and Hood Canal river systems to the south were among the rivers most