This January 2013 photo provided by Rolf Peterson shows a female moose 

This January 2013 photo provided by Rolf Peterson shows a female moose and her 9-month-old twin calves on Isle Royale in Michigan. The park’s moose population was estimated at 975 this year and is growing because of improving forage supplies and a drop in the number of wolves that prey on moose. (AP Photo/Courtesy Michigan Technological University, Rolf Peterson)
Associated Press
This January 2013 photo provided by Rolf Peterson shows a female moose and her 9-month-old twin calves on Isle Royale in Michigan. The park’s moose population was estimated at 975 this year and is growing because of improving forage supplies and a drop in the number of wolves that prey on moose. (AP Photo/Courtesy Michigan Technological University, Rolf Peterson)
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