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Several members of an Isle Royale wolf pack in this 2006 photo include the immigrant male wolf (the gray wolf in the middle right) along with his radio-collared daughter and mate wolf on the far right. The single male, which crossed to the island in 1997, has 22 offspring, 34 grand-offspring and is responsible for 56 percent of the gene pool among island wolves. (Photo courtesy Michigan Technological University)

Isle Royale pack down to 2 female wolves

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The number of wolves roaming on Lake Superior's Isle Royale has dwindled to just 16 with only two breeding females -- a population level researchers say may not be sustainable much longer.


If the two remaining mating females were to die before raising female pups, the wolf population could be headed to extinction.

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