Springboks get their name from their jumping abilities. They can leap up to 11.5 ft. (3.5m) and bounce up again when they hit the ground. Springboks have a fold of skin along their backside. When they become alarmed or excited, the fold will turn outward to show a crest of white hair. During the 1800s, Springboks made up some of the largest herds on earth. Some herds had as many as 10 million animals and were over 90 mi. (150km) long. These antelope are not as numerous as they were then. They have, however, been introduced into animal reserves and parks.