As summer gets into full swing in Wyoming, many people will be getting outside and hitting the state’s trails. In his new book On Trails, author Robert Moor explores why animals and humans make trails in the first place, and what they end up meaning to us. He told Wyoming Public Radio’s Caroline Ballard and he got the idea to write a book after hiking the Appalachian Trail. The paperback edition of On Trails is out July 4th.