In 1900 there were 20 million mustangs that roamed the American West. Today there are less than 30,000.
Stoms build in the open western lands as horses move across the range.
The Gila herd are of Spanish origin and came to North America with the Conquistadors in the 1600s. They were rescued by Karen Sussman and the International Society for the Protection of Mustangs and Burros.