Most of the heart of Yellowstone is only accessible by snow coach or snowmobile during the winter months. I was lucky enough to get on a trip in to the park to Old Faithful on one of these tracked snow coaches. It was a full day trip, with snow and wildlife all around! Pictures below.
One of the first furry creatures we saw was this fox, hunting in an open field.
Behind the fox was another spectacular view.
A bison standing in the same field.
Old Faithful and several other features in the Upper Geyser Basin.
These “painted” trees have soaked up minerals in to their bases, causing them to turn white. 
The Madison River
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If you’re interested in a trip for yourself, I’d recommend a trip with Buffalo Bus Tours and check out the Faithful Street Inn for vacation rental cabins!