Craig Jourdannais

Elk are a familiar sight in much of Montana now, but that hasn't always been the case. By the early 1900s, unregulated hunting had led to massive declines in wildlife nationwide. But In Yellowstone, elk populations were exploding thanks to protections in place there. The solution to restoring elk outside the park seemed obvious. Less obvious was how to make it happen. This week on the Big Why, we trace the animals' bumpy path from the living laboratory called Yellowstone Park to the Bitterroot Valley and beyond.

It’s big game season in Montana, and hunters aren’t the only ones tracking the state’s elk herds. Wildlife biologists are currently studying the animals’…