CHICAGO —  The Brookfield Zoo is helping re-establish the Mexican wolf population in the southwestern US and Mexico. 

Six of seven Mexican wolf puppies born at the zoo last month were placed days later in wild dens as part of a federal recovery program.  

Of those six pups, four are males and two are females. 

Three were put in a wild pack in Arizona and the other three in new mexico.  

The seventh pup will remain at the zoo. 

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Guests will be able to see the male pup when he emerges from his den in the coming weeks.