Under the freeway and through the woods they’ll go...if Karsten Heuer has his way. “They” are large mammals of the northern Rockies—grizzlies, wolves, wolverines, lynx. Heuer is a biologist trekking from Yellowstone National Park to the Yukon Territory to promote “Y2Y,” a wildlife corridor that would cover the same territory.

Dangling from a crane, teetering on horseback along a mountain ledge—Radio Expeditions audio engineers go to extremes to capture the call of the wild. These unsung heroes make the series truly sing—from the unforgettable arias of humpback whales to the battle hymn of bees on the attack.

In The Story Behind the Story eavesdrop on the adventures of audio engineer Charles Thompson in Banff and beyond.