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In this April 30, 2013 photo, a bison stands in a field at Blue Mounds State Park near Luverne, Minn. At the end of June 2015, a bill was re-introduced in the U.S. House to designate the bison as the national mammal of the United States. It's called the National Bison Legacy Act. (Emily Spartz Weerheim/The Argus Leader via AP)

In this April 30, 2013 photo, a bison stands in a field at Blue Mounds State Park near Luverne, Minn. At the end of June 2015, a bill was re-introduced in the U.S. House to designate the bison as the national mammal of the United States. It's called the National Bison Legacy Act. (Emily Spartz Weerheim/The Argus Leader via AP)

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