Incredible Families Sneak Peek

It's spring and the northern forests are bursting with life. Fifty-feet up a tree a mandarin duck emerges from her nest hole with her young family, which only hatched a day before. Watch as the baby ducklings make the leap down to the forest floor! Don't miss the world premiere original special, 'Planet Earth: Incredible Families,' on Sunday, May 20 at 10/9c. Only on BBC America!