I recently got this on Blu Ray, but it's an Earth documentary (filmed in High Def, costing $25 million to make) on all media formats done by BBC and narrated by David Attenborough (who has a real good voice for Narration). I have watched only part it so far and I am simply amazed by this planets Natural sites and the animals we live with. I have always been intrigued by how animals act and work, it is astounding to see Wild Dogs working together, setting up in places like a military formation, to chase their pray. Seeing the size of a Great White Shark, jumping out of the water to catch a seal. How much air it gets, the size of it's body, it's mouth, such an astounding monster. A migration of 3 million (forgot the name of the animal) in Canada. The treks made by Elephants across barren Africa and seeing the changes the rainy season makes for them. And to see places where no human has ever set foot, great glaciers and blankets of smooth snow, sandstorms that reach across half the world in journey. A highly recommended show for anyone who hasn't seen it.