Pine marten

A pine marten keeps watch in Yellowstone National Park, Wyo., a magical place to visit in winter.

Standing in hip-deep snow while watching the sunset over the snow-covered mountains, I could hear the howling of four wolves in the distance.

Yellowstone in winter is a magical place. Filled with all the animals that a healthy ecosystem should possess. From the top-tier predators such as wolves, bobcats and mountain lions, right on down to the smallest mice and shrews, and everything in-between.

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