Aside from these main stories, we are also treated to brief snippets of wildlife from around the world, including the birds of paradise of Papua New Guinea, and the autumn migration of the demoiselle cranes. Of course, entire films might have been dedicated to these species alone, and an inevitable consequence of having to sift through so much footage is that some interesting ecosystems are glossed over far took quickly. By choosing to focus most closely on the polar bear, elephant and humpback whale – tracing their lifestyles, via some astonishing high-definition time-lapse photography, throughout a calender year – the filmmakers were able to avoid any structural problems that might arise from having so much to show, and only 90 minutes to show it. Consequently, 'Earth' left me thirsting for more, and, fortunately, I now have approximately eleven hours more, as soon as I can track down a copy of the DVD box-set for "Planet Earth." Uplifting and tear-jerking, awe-inspiring and heartrending, 'Earth' is a truly magnificent documentary experience, and it might just be my favourite film of 2007.