Early humans hunted because their survival depended upon success as a hunter. Some anthropologists even hypothesize that language developed because of its importance to early human hunters. Skill and success as a hunter often determined whether families and clans would have animal foods. Skins were used for both clothing and shelter as well as for other purposes. Bones, antlers and teeth were used for tools. Animal parts were used as decoration or symbols of authority and status. In some situations early man for protection from predators used hunting skills.