Every spring, 500,000 sandhill cranes flock along a large river in the midwestern United States. After having wintered in the American South, they stop to build up their strength in preparation for their long journey to Alaska, where they will spend the summer. They also look for mates. Once they reach Alaska, the pairs work together to raise their young. When the juveniles become 3 months old, they accompany their parents on their migration. This is a record of the sandhill cranes' grand journey across North America.
