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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.

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