[Yellowstone] Gray wolves carry young pups over rugged terrain to track spring elk migration
From Phys.org:
Gray wolf pups are born nearly helpless: blind, deaf and lacking the acute sense of smell of their elders. They usually remain in the safe confines of their den until they are at least three weeks old.
That is why UC Berkeley biologists were surprised to observe gray wolves near Yellowstone National Park traveling 20 kilometers or more over rugged, mountainous terrain, with very young pups in tow.
