A herd of bison walk along a river bank in snow.
Bison along the Yellowstone River
Keywords: yellowstone national park; bison; bison bison; wildlife; mammals
Bison moving along the snow-dusted bank of the Yellowstone River. The park is worth considering in shoulder seasons — wildlife tends to be more visible and more active when the summer crowds thin out. © NPS/Diane Renkin, Public domain, via Wikimedia Commons

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