When cities and highways grow, wild places shrink. That means less habitat for wildlife. This is what the "Wildlands Network” focuses on. Its co-founder is John Davis. He’s on a ten month journey from Mexico to Alaska. And he hopes to learn more about the places where humans are preventing cougars, wolves, and bears from roaming freely. As he passed through Denver, Davis stopped by our studio to talk with Ryan Warner.

Follow John Davis's journey.

[Photo: John Davis/Trek West]