Yellowstone is vast. It covers an area of nearly 3,500 square miles, predominantly in the US state of Wyoming, on the Yellowstone Plateau in the Middle Rocky Mountains, at an average of 8000 feet above sea level.
The high altitude and distance from the warm oceans means winters in Yellowstone are severe. Deep snow simplifies the landscape and temperatures often dip below -30ºC producing amazing hoar frost as steam from half of the worlds geothermal features freezes on anything it touches.
We were due to travel to the Grand Tetons but snow storms made the Teton Pass unusable. This, however, gave us more time in the Lamar Valley in the north of the park. Here we spotted a rare, but distant, lone wolf - the covering of snow making it easier to spot against the landscape - and we spent an hour photographing a tiny, but swift, ermine.
Throughout the park Bison were in abundance - snow freezing to their mottled fur as they desperately dug for grass - and Coyote, Elk and Moose roamed the landscape.
Not many travel into Yellowstone in the Winter making it a peaceful and serene location that provides the perfect backdrop for more minimalist photography.