The American Bison (known most commonly as Buffalo) is the largest animal in North America.  They are up to about 6 1/2 feet tall and can weigh over 2000 lbs.  Even though they are extremely large, they are very quick and agile movers.  Their curved horns grow to be about 2 feet in length.  They are grazers and eat not only grass but also shrubs and herbs, even twigs.  Their meat is especially good and known for its healthy qualities.  A buffalo can live up to about 20 years.