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Gallery: Best Wallpapers of 2008

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A remote-controlled "carcass cam" captures an inside view of a gray wolf fiercely guarding its meal at the International Wolf Center in Ely, Minnesota. Wolves at the center are provided with food, but wild populations generally hunt in packs. After a large kill, a single wolf can consume more than 20 pounds (9 kilograms) of meat. (Photo shot on assignment for, but not published in, "Return of the Gray Wolf," May 1998, National Geographic magazine) Buy a print of this photo. Photograph by Joel Sartore