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Where do gray wolves make dens for their pups?

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Gray wolves typically select natural sites for their dens to protect their pups. These dens are often located in hillsides and may consist of natural holes or burrows.1

Other common den locations include:
* Rock crevices1
* Hollow logs or overturned stumps1
* Abandoned beaver lodges1
* Depressions beneath the lower branches of a conifer1

After a few weeks, the pack typically moves the pups from the den to an aboveground "rendezvous site" where they remain while the adults hunt.1