Leonardo DiCaprio chose to devour a raw slab of bison's liver, even though he is vegetarian.

Leonardo DiCaprio chose to devour a raw slab of bison's liver, even though he is vegetarian. He also had to learn to shoot a musket, build a fire, speak two Native American languages (Pawnee and Arikara), and study with a doctor who specializes in ancient healing techniques. DiCaprio calls it the hardest performance of his career.