Alaska: A Year in the Wild: Spring

Winter's grip loosens as spring arrives in the northern American state. As the days lengthen and temperatures rise, a transformation is triggered that ranks as one of the most spectacular on the continent. However, spring in Alaska is short as the creatures have less than two months to feed, mate and raise a family - all the while avoiding the attentions of predators. The season also sees tens of millions of migrating birds return to the region, and hungry creatures re-emerge from hibernation, such as the grizzly bear