The massive skeleton of the African ---------- accounts for about 15 percent of the body weight, just as in a man of slender build; however, the elephant's skeleton supports as much as four tons per leg, and is thus stressed close to the physical limit for bone. To keep from damaging its skeleton, an African ---------- has to move sedately, never jumping or running. The "charge" of these animals is a fast walk on long legs, at about 15 miles per hour.?