A vast migration. Cranes take turns to lead their flock: The feathered arrow. Follow a flock of cranes on a migration by land and sea, and find out how animals forge unlikely partnerships to help each other in the wild. Simple haiku poems and fascinating facts give a powerful message of togetherness.A vast migration. Cranes take turns to lead their flock: The feathered arrow. Follow a flock of cranes on a migration by land and sea, and find out how animals forge unlikely partnerships to help each other in the wild. Simple haiku poems and fascinating facts give a powerful message of togetherness.