Zebras move in files led by a dominant female, whereas the dominant male walks through the group or closes off the line to ensure safety. In the event of a threat, he remains at the back of the group to defend it. The foals are brought back to the front of the flock, which is the safest place. Zebras can keep a speed of 18.6 to 24.8 miles/h (30 to 40 km/h) over a very long distance and, in case of danger, run at more than 40 miles/h (60 km/h) on average.