 Although not federally designated, the National Bison Association is celebrating July as National Bison Month. According to bisoncentral.com, bison is the leanest protein widely available to consumers today while being nutritious with 26% more iron and is 87% lower in fat than conventional beef. And based on nutrient data from the USDA, bison has 766% more B12 vitamins in chicken and has 32% less fat.