to better understand the relationship between various Iberian horse breeds and wild horse subspecies. History Although it is known that the Sorraia developed in the southern part of the Iberian peninsula, the breed was isolated and unknown to science until the 20th century. Despite the lack of documentation, attempts have been made to reconstruct its history. Paleolithic parietal art images in the region depict equines with a distinct likeness to the Sorraia, with similar zebra-like markings. Analysis of mtDNA has been performed on Mustangs in the western United States that show similar mtDNA patterns between some Mustangs and the Sorraia breed. Spanish conquistadors took Iberian horses, some of whom closely resembled the modern-day Sorraia, to the Americas in their conquests, probably as pack animals. Similarities between the Sorraia and several North and South American breeds are shown in the dun and grullo coloring and various physical characteristics. This evidence suggests that the Sorraia, their ancestors, or other horses with similar features, may have had a long history in the Iberian region and a role in the creation of American breeds. Otherwise, the Sorraia breed was lost to history until 1920, when Portuguese zoologist and paleontologist Dr. Ruy d'Andrade first encountered the Sorraia horse during a hunting trip in the Portuguese lowlands. This remnant herd of primitive horses had continued to live a wild existence in these lowlands, which were rather inaccessible and had been used as a hunting preserve by Portuguese royalty until the early 1900s. At the time of d'Andrade's initial meeting the breed, the horses were ill-regarded by native farmers, although they were considered hardy native fauna that lived off of the uncultivated lands and salt marshes in the local river valleys. For centuries, peasant farmers of the area would occasionally capture the horses and use them for agricultural work, including threshing grain and herding bulls. In the 1920s and 1930s, as mechanization became more prevalent, both wild and domesticated breeding stock diminished to almost nothing, and d'Andrade, along with his son Fernando, encouraged the conservation of the breed. In 1937, d'Andrade began a small herd of his own with five stallions and seven mares from horses obtained near Coruche, Portugal. All Sorraias currently in captivity descend from these original horses obtained by d'Andrade, and it is believed that the remnant wild herds of the breed died out soon after. These horses were kept in a habitat similar