In 2014, the dams on the Elwha River in Washington State were removed. As the river ran free again, salmon from the Pacific were able to spawn upstream for the first time in 100 years, dramatically improving conditions for American Dippers. Recent research has demonstrated that birds with access to salmon have higher survival rates. And they are 20 times more likely to attempt to raise two broods in a season, the most important contributor to population growth.

More info and transcript at BirdNote.org. 

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