Watch an exclusive sneak peek of the world premiere special PLANET EARTH: INCREDIBLE FAMILIES before its debut *** Sunday May 20 at 10pm/9c *** Travel 50 feet up a tree in the northern forests in Spring as a Mandarin Duck emerges from her nest hole... followed by her young family, hatched only the day before. The ducklings can't fly yet - so there's no choice but to make the leap down to the forest floor. You won't want to miss as these ducklings jump down! Every Sunday evening, relive the incomparable beauty of PLANET EARTH in back-to-back episodes, then dive deeper into the series' most amazing moments in all new World Premiere Specials dedicated to the world's most fascinating wildlife. This week, we explore the most breath-taking and touching courtship, birthing and parenting behaviors - in PLANET EARTH: INCREDIBLE FAMILIES. Want more Planet Earth? Visit http://www.bbcamerica.com/planet-earth/ Keep up with all of the best shows on BBC America by following us on Facebook and Twitter! http://twitter.com/bbcamerica http://www.facebook.com/bbcamerica