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Biologists are hoping the increase in the population figures of Mexican gray wolves is a sign that the recovery effort to save the endangered species is finally taking off.

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Fish and Wildlife Service biologists recapture just-released wolf

With 75 wolves in the wild after a 15-year effort, conservation groups criticize delays

The number of reintroduced Mexican gray wolves in the wild grew from 58 in 2011 to 75 in 2012, according to a federal population survey released this week.

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