This Jan. 24, 2013 photo provided by John Vucetich shows an aerial of three wolves and a moose carcass on Isle Royale National Park in Michigan. Scientists said Monday, March 25, 2013 the park's gray wolves are at their lowest number in more than 50 years and may have stopped reproducing. Researchers say the wolves helped keep the moose population, which has risen in recent years, in check. (AP Photo/Courtesy Michigan Technological University, John Vucetich)

Associated Press
This Jan. 24, 2013 photo provided by John Vucetich shows an aerial of three wolves and a moose carcass on Isle Royale National Park in Michigan. Scientists said Monday, March 25, 2013 the park's gray wolves are at their lowest number in more than 50 years and may have stopped reproducing. Researchers say the wolves helped keep the moose population, which has risen in recent years, in check. (AP Photo/Courtesy Michigan Technological University, John Vucetich)
This Jan. 24, 2013 photo provided by John Vucetich shows an aerial of three wolves and a moose carcass on Isle Royale National Park in Michigan. Scientists said Monday, March 25, 2013 the park's gray wolves are at their lowest number in more than 50 years and may have stopped reproducing. Researchers say the wolves helped keep the moose population, which has risen in recent years, in check. (AP Photo/Courtesy Michigan Technological University, John Vucetich)
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