Caven's Bread and Butter Lure is a careful blend of several 'rat calling agents and has a very piercing odor which is a must in 'rat lures. Muskrats are truly the "Bread and Butter" of the industry. Year after year they lead the country in total pelts and total dollars generated for the trapper. The muskrat is a lot harder to "lure' consistently than a fox ever thought about being! Is muskrat lure really worth using? Yes! If it's used properly and if it's the right lure.