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
Mountain and moorland pony breeds graze freely on lush forage may develop related health problems, including laminitis. The various types range from about to over . Shetlands are smaller, not to exceed . Shetlands are measured in inches. Some breeds, such as the Exmoor, are uniform in colour and pattern, but others permit a wide range of colours. However, the Shetland is the only M&M breed that can be skewbald or piebald, though even Shetlands cannot be "spotted." Several types of mountain and moorland ponies still live in a semi-feral state on unenclosed moorland or heathland. These areas are usually unfenced common land, on which