Set by park managers, the bison herds in Theodore Roosevelt National Park are kept to between 200 to 400 animals for the South Unit and 100 to 300 for the North Unit.

Theodore Roosevelt was one of most dynamic Presidents in White House history, and on the occasion of his 158th birthday, here are 10 fascinating facts about the 26th President.

When Theodore Roosevelt moved into the White House in 1901, he brought with him his wife, his six children, and one of the widest (and wildest) menageries Washington, D.C. has ever seen.