A Wood Chipper is a machine used for reducing wood (generally tree limbs or trunks) into smaller wood chips. They are often portable, being mounted on wheels on frames suitable for towing behind a truck or van. The machines are suitable to be fed with tree trunks, tree branches, tree leaves, bamboo, soyabeanstalks, cotton stalks, wooden blocks, tree hides, animal feed, raw materials for preparing biomass and other forestry waste