Michael Quinton / Dall's Sheep (Ovis dalli) ram, lamb, and ewe, Yukon Territory, Canada

Matthias Breiter / Aurora borealis above taiga, Whitehorse, Yukon Territory, Canada

Matthias Breiter / Aurora borealis above taiga, Whitehorse, Yukon Territory, Canada

Theo Allofs / Autumn in the Ogilvie Mountains and boreal forest near the Dempster Highway, Yukon, Canada

Staffan Widstrand / White water river rafting, Yukon, Canada.

Patricio Robles Gil / St. Elias Mountains, Kluane National Park, Canada

Patricio Robles Gil / Glacier, St. Elias Mountain, Kluane National Park, Canada

Tim Fitzharris / Pond reflecting Nisling Range, Yukon Territory, Canada

Peter Mather / Caribou (Rangifer tarandus) porcupine herd in winter near Dempster Highway, Yukon, Canada

Peter Mather / Caribou (Rangifer tarandus) porcupine herd crossing Blow River, Yukon, Canada

Peter Mather / Caribou (Rangifer tarandus) porcupine herd crossing river valley, Yukon, Canada

Peter Mather / Yukon River outside of Dawson City, Yukon, Canada