An ephemeral ecosystem of tunnels in the snow is home to insects, frogs, rodents and even flowering plants. But as the climate changes, is it about to collapse?
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Two grizzly bears fighting, a group of bison ploughing through a field of snow and the stars lighting a hiking trail are among the pictures selected as the 20 finalists in a photography competition showcasing images from US national parks.
All 20 images were the winners of the first ever annual Nature s best Photography National Parks Photo competition and were the top 20 placed images chosen from more than 3,000 entries.
One image taken by photographer, Brian Wright of San Diego, California, showed the star trails over the Chesler Park Hiking Trail, Canyonlands National Park, Utah. Grizzly bears : This stunning photo by Thomas Vijayan shows the brutality of nature as two grizzly bears duel in Katmai National Park, Alaska