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This photo provided by the U.S. Fish and Wildlife Service Mexican Wolf Interagency Field Team, shows a ​San Mateo Mexican wolf litter, including two pups cross-fostered from the Illinois Brookfield Zoo, in their wild den in New Mexico on May 3, 2017. Federal wildlife officials say they have successfully placed two captive-born Mexican gray wolf pups into the wild den with a foster family, clearing the way for a cross-fostering project aimed at boosting genetic diversity among wolves in the wild in New Mexico and Arizona. (U.S. Fish and Wildlife Service/Mexican Wolf Interagency Field Team via AP)

This photo provided by the U.S. Fish and Wildlife Service Mexican Wolf Interagency Field Team, shows a ​San Mateo Mexican wolf litter, including two pups cross-fostered from the Illinois Brookfield Zoo, in their wild den in New Mexico on May 3, 2017. Federal wildlife officials say they have successfully placed two captive-born Mexican gray wolf pups into the wild den with a foster family, clearing the way for a cross-fostering project aimed at boosting genetic diversity among wolves in the wild in New Mexico and Arizona. (U.S. Fish and Wildlife Service/Mexican Wolf Interagency Field Team via AP)

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