Award-winning journalist Amy Martin has spent years tuning into nature’s hidden soundtrack. As the host and creator of Threshold, she explores the intricate ways life communicates beyond human perception. In its latest season, Hark, Amy uncovers how species from birds to dolphins—and even turtles—use sound to share information we’re only beginning to understand. Thanks to breakthroughs in acoustic research, these conversations are finally coming into focus.

Scientists mentioned: Mike Parsons, Rex Cocroft, and Gabriel Jorgewich Cohen

Photo credit: Nick Mott and Jed Allen

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• Finding Mastery

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