North Ronaldsay

Sheep

The North Ronaldsay is a breed of sheep living on North Ronaldsay, the northernmost of the Orkney Islands, Scotland. They are notable for living almost entirely on seaweed for several months of the year, except for a short lambing season – this is the only forage available to them, as they are confined to the shoreline by a 6 feet (1.8 m) tall dry-stone wall which encloses the whole island. This breed is raised primarily for wool.

http://en.wikipedia.org/wiki/North_Ronaldsay_(sheep)