A multitude of factors are harming Puget Sound’s local population of endangered orcas: water pollution, noise, loss of habitat. But topping that list right now for many scientists is recovery of their primary food source: Chinook salmon. The tragic scenes captured on the water over the past week – of the grieving orca J35 incessantly carrying her deceased calf, and of 4-year-old J50 ill and starving – are sad events, but not surprising to scientists working on orca recovery. They say they