Bison suet is the firm internal fat, specifically from around the bison's kidneys, that can be rendered into tallow for cooking, skincare, or other uses. This high-quality, nutrient-dense fat is rich in omega-3 fatty acids and conjugated linoleic acid (CLA), making it a flavorful and wholesome fat source, though it is less common than beef suet due to the naturally lean nature of bison.