Pottok the Losino, the Galician, the Landais, and the Monchino horses. Tests have revealed considerable genetic differences between populations in the Northern Basque Country and the Southern Basque Country, leading some to consider them separate breeds. Some claim the Pottok's origins derive from the horses on ancient cave paintings in the area and thus claim to descend from the Magdalenian horses of 14,000–7000 BC. Other link its origins to an influx of horses during the Bronze Age. However, neither of these theories has to date been scientifically verified. Genetic research by the University of the Basque Country's Genetics, Physical Anthropology and
Shetland animal breeds which was also the ancestor of the Hebridean and North Ronaldsay sheep). Shetlands are classed as a landrace or "unimproved" breed. Although Shetlands are small and slow-growing compared to commercial breeds, they are hardy, thrifty, easy lambers, adaptable and long-lived. The Shetland breed has survived for centuries in difficult conditions and on a poor diet so they thrive in better conditions. Shetlands retain many of their primitive survival instincts so they are easier to care for than many modern breeds. Shetland was the last surviving locality for a type of domestic pig known as the "grice." Small in size yet