The documentary is called Penguins - Spy in the Huddle, and any of our readers in the UK can watch it online right now. For the rest of us, we'll have to be content with the snippets exposed in a YouTube clip. The film makers crafted multiple penguin-cams, each able to perform different actions to blend in with a different species. The Emperor Penguin model had a camera in its belly, and one in its eye, and was able to roll along the ice. Others could walk or swim, and they even created eggs with cameras built-in.