On this edition of our podcast about Yukon photography, Mark Kelly and Alistair Maitland speak with Peter Mather. For more than two decades, Peter has been documenting the Porcupine Caribou Herd of the northern Yukon, and the struggles of the Gwich'in people to protect the herd's calving ground in Alaska from oil development. Peter talks about his passion for the caribou and the people who rely on them.