The grey wolf was reintroduced to Yellowstone National Park and part of Idaho in 1995, after being extirpated 70 years earlier. Captured in Canada and brought to the US, these wolves are genetically identical to those that once roamed widely across the country. As of 2015, the wolf population in Montana, Idaho and Wyoming is about 1,600. Ninety percent of the wolf diet is elk. Males can weigh up to 230 pounds. The average lifespan of a wolf in the wild is six to seven years. For more about wolves, click here: http://www.defenders.org/gray-wolf/basic-facts
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