May 28, 2013 · To create the composting area, build a 2- to 3-foot-deep bed of wood mulch on a flat surface; the larger the animal, the closer to 3 feet in depth the bed needs to be. Place the carcass on the bed of woodchips and cover with 4 feet of wood mulch, heaped into a conical shape. (The cone shape allows the compost pile to shed water and encourages