The feral horse population of Assateague Island is alternately known as the Assateague horse in Maryland and the Chincoteague Pony in Virginia. This distinction, made both on per-breed and per-individual basis, is sometimes a matter of disagreement. The traditional definition of a horse or a pony is based on whether the animal in question falls over or under . The equines on the island tend to be under 14.2, but have a horse phenotype. It is argued that their relatively small size is primarily due to environmental, rather than genetic conditions. The National Park Service provides information about these animals through brochures and the internet.