North Ronaldsay (sheep) - Characteristics

Characteristics

The sheep have evolved a somewhat different physiology from other sheep, due to their unusual diet – their digestive system has adapted to extract the sugars in seaweeds more efficiently, and they have an increased susceptibility to toxicity to the trace element copper. The grazing habits of the sheep have also adapted to their peculiar diet: instead of grazing during the day and ruminating at night as other sheep generally do, the North Ronaldsays graze as the tide reveals the shore (twice in 24 hours), ruminating at high water. The sheep's source of fresh water is limited to the few freshwater lakes and ponds along the seashore.