Deep in the heart of Yellowstone National Park, audio recorders roughly the size of hardcover books are documenting wolf barks, elk bugles and bird chirps 24 hours of the day, seven days a week, 365 ...
You’re out there in the backcountry, the crisp air is filled with the sounds of nature, and you’re soaking it all in. Then, you spot them: a pair of sharp yellow eyes watching you from the treeline.