Why do gray wolf packs move their pups from dens to rendezvous sites?

Gray wolf packs move their pups from dens to aboveground rendezvous sites after a few weeks to provide a location where the young can play and sleep while the adults are away hunting.12

Throughout the spring and summer, these rendezvous sites serve as the geographic focus of the pack's activities, with the pups remaining the center of attention for the group. As the summer progresses, the pups grow rapidly and are moved to different locations more frequently and over greater distances until the pack begins to travel throughout its territory again in the autumn.12