Worms just might be the ultimate in livestock. I compost in place. They eat, poop, pee, pass gas, breathe and multiply. All of this provides benefits to plants. They also dig which by extenstion aerates, provide water channels and moves nutrients from my aisle based compost into the beds. Oh, and did I mention efficient? One pound of compost will result in adding 1 pound of worms. The larger the animal, the less efficient the conversion (you need 15 pounds of feed to make 1 pound of beef).