I saw that too. Such an amazing and beautiful documentary!
![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
Have you seen Winged Migration (I think that's the right title)? Its just as good. It was filmed over something like 3 years and on every continent. Its beautiful, sad and breathtaking like the penguin one.