During Greenland Stadial 2 (the Last Glacial Maximum[1]) the North Sea retreated northward, as sea levels were up to 125 metres (410 ft) lower than today. The woolly rhinoceros roamed the exposed Doggerland and much of Northern Europe and was common in the cold, arid desert that later became southern England[2] and the North Sea today. Its geographical range expanded and contracted with the alternating cold and warm cycles, forcing populations to migrate as glaciers receded.