There is an effort underway to have the American Buffalo designated as the National Mammal of the United States. The National Bison Legacy Act, S.B. 3248 / H.R. 6304, was introduced by Senators Enzi (WY) and Johnson (SD) and Congressmen Clay (MO-1) and Fortenberry (NE-1).
http://salsa.democracyinaction.org/o/2426/p/dia/action/public/?action_KEY=11470