Science & EnvironmentStudy: Chinook salmon are key to Northwest orcas all yearBy GENE JOHNSON (Associated Press)SEATTLE March 4, 2021 2 p.m. Updated: March 4, 2021 2:01 a.m.A new study from federal researchers provides the most detailed look yet at what the Pacific Northwest’s endangered orcas eat📨 Daily news in your inboxSign up today for OPB’s “First Look” – your daily guide to the most important news and culture stories from around the Northwest.EmailPlease leave this field blankSign up