There are some important differences between horns and antlers.
New grassland conservancies are giving a home for the bison to roam, as they once did before going nearly extinct during the 19th century.
How did animals respond to the ice age? Ancient bison preserved in the Canadian arctic have given scientists a clue.
How do biologist find DNA from organism that lived thousands of years ago? Find out on this Moment of Science: "DNA Dirt".