Bison (Bison bison) at Yellowstone NP, national mammal of the United States.On May 9, 2016, President Obama signed the National Bison Legacy Act into law, officially making the American bison the national mammal of the United States. This image is suitable for use in educational or interpretive exhibits, displays, Powerpoints, posters, social media, blog posts, a cover page, and classroom educational products. It is a high resolution JPEG file.I have taken all of the photographs listed. All phot