What size is a mustang wild horse herd?

Mustang wild horse herds typically range in size from 5 to 30 individuals, although some herds may be larger or smaller. Herds are usually composed of a single stallion, several mares, and their offspring. The stallion is the dominant male in the herd and is responsible for protecting the mares and young from predators and other stallions. Mares typically stay in the same herd for life, while young males (colts) are driven out of the herd when they are about 2 years old. Colts then form bachelor bands with other young males until they are old enough to challenge a stallion for dominance of a herd.