The colonial Spanish horse comes from old Iberian breeds, and horse of the Sulphur Springs herd are one of the types that retain many of the the traits of the endangered Sorraia.
The Sulphur Springs Registry, while not the greatest website (too many broken links), does have some good background information on the herd.
These twelve Sulphur Springs mares that arrived in Southern California two weeks ago, will be part of a foundation herd to be re-introduced into their natural habitat. Four stallions removed from Coyote Canyon will be part of the efforts (sorry boys, these gals are already all pregnant!) spearhead by Kathleen Hayden of the nonprofit Coyote Canyon Caballos d' Anza.
The group has had many benefits and fundraisers to support the herd growth and objectives.