Casey Anderson

There are now more grizzly bears in more places in and around Yellowstone National Park than at any time in over a century. But until this spring, the population lacked genetic diversity. Montana Public Radio’s Nick Mott reports on how fresh bear genes got into Yellowstone, and what it could mean for the bears' endangered species protections.

Most people don’t describe crawling into mountain lion dens in the middle of winter or exploring abandoned buildings littered with animal corpses by…