Emperor Penguins return from the seas to feed their young, and dramatic scenes unfold as they hesitate at the edge of the Antarctic sea ice when they see a Leopard Seal is on the prowl. Brilliant wildlife short from BBC natural history show, Blue Planet. Watch more high quality videos on the BBC Earth YouTube channel here: http://www.youtube.com/BBCEarth and visit http://www.BBCEarth.com for all the latest natural history exclusives and fantastic new wildlife videos.