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I spent a couple of nights in Yellowstone and a third at Grand Teton National Park. Both excellent national parks (though Yellowstone is very busy) with some fine mammals from the suite of Arctic species. The Million Dollar Cowboy Bar in Jackson Hole is worth a visit.
 
Yellowstone, July 1993 – Moose, Black Bear, Bison, Mountain Cottontail, Uinta Ground Squirrel, and a White-tailed Prarie Dog somewhere near the park. Dipped on Grizzlies which were occasionally spotted on the Hayden Meadows back then, but apparently now more common.

Bison at dawn, Yellowstone NP