Brown hares were introduced in Iron Age times, from the other side of the North Sea. They are widespread on low ground throughout England, Wales and Scotland. Although they have been more recently introduced to Northern Ireland, they have not spread far. They have also been introduced to the Isle of Man and Mainland Orkney. In Scotland brown hares are found on farmland and rough grazing to the far north of the mainland, but are absent from parts of the North West. Brown hares are replaced by mountain hares in upland areas of Scotland and central England.