Two wood bison bulls weighing upward of 2,000 pounds move toward higher ground at the Alaska Wildlife Conservation Center on Sunday, March 22, 2015, in Portage, Alaska. The Alaska Department of Fish and Game on Sunday moved the first wood bison to a staging area in Shageluk, Alaska, for reintroduction in a few week to their native Alaska grazing grounds. Wood bison, which are larger than plains bison native found in Lower 48 states, disappeared from U.S. soil more than a century ago. (Photo by Dan Joling/AP Photo)
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