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COMMERCE CITY, COLORADO MARCH 17, 2007- ROCKY MOUNTAIN ARSENAL NATIONAL WILDLIFE REFUGE After almost exactly 24 hours loaded on the 18 wheeler, the 16 American Bison were released onto their new rangeland at the Rocky Mountain Arsenal National Wildlife Refuge. The of 13 female cows and 3 bulls arrived from the National Bison Range in Moiese, Montana. These two getting off the back of the trailer are females. A large berm was constructed to allow the bison to walk gently off the truck and onto the ground. PHOTO BY HELEN H. RICHARDSON (Photo By Helen H. Richardson/The Denver Post via Getty Images)