The heaviest land mammal is the African bush elephant, which weights up to 10.1 tonnes (11.1 short tons). It measures 10–13 ft at the shoulder and consumes around 500 lb of vegetation a day. Its tusks have been known to reach 9 ft in length, although in modern populations they are most commonly recorded at a length of 2.0–3.0 ft. The average walking speed of an elephant is 4.5 mph, but it can run at recorded speeds of up to 15 mph.

Source: Wikipedia