AML - Appropriate Management Level. The number the BLM considers to be the best population level for wild horses. Now, there are about 39,000 wild horse; the AML is 23,000. The BLM hopes to reach this level by about 2005.
Bay - A horse of a reddish brown color with a black mane and tail.
BLM - Bureau of Land Management, a division of the U.S. Department of Interior. The agency charged with managing national lands and the resources, including wild horses.
Chestnut - A horse of a brown or reddish brown color with main and tail of about the same color.
Dorsal stripe - A dark stripe down the spine of the horse.
Foal - A young horse, usually of less than a year.
Gelding - A neutered male horse.
Grullo - A horse of a dun color that looks like a mix of gray/blue and brown with darker legs and often with a dorsal stripe down the back.
Hand - A measurement of 4 inches, once based on the width of your hand. Horses are measured to the top of the shoulder, which is usually just a little higher than the back height.
Mare - A female horse that has given birth.
Mustang - Wild horse that roams free. The government defines the animals it protects as unbranded and unclaimed horses on public lands of the United States.
Sanctuary - A place of refuge and protection.
Sorrel - A horse of a brown or reddish brown color with a much lighter mane and tail.
Stallion - A male horse.
Zebra stripes - Horizontal stripes marking the legs. Considered to be a sign a horse is closer genetically to the original wild horses of Spanish (Sorraia or Barbary) descent. A high percentage of horses in several government-managed herds exhibit these characteristics, including those in the Pryor Mountain Wild Horse Refuge in Montana.