Nesting in her ice den, Polar Star has waite d five long months for her cubs to be born. Now they are big enough to leave the safety of the den, and they must all se t out on a journey across the treacherous sea ice. The story is aimed at age 2+. 'Nesting in her ice den, Polar Star has waite d five long months for her cubs to be born. Now they are big enough to leave the safety of the den, and they must all se t out on a journey across the treacherous sea ice. The story is aimed at age 2+. '