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The alpha members of the pack eat first, challenging lower level wolves.

The wolf pack rushes in to secure a hold on doomed calf.

Alpha male closes the gap on muskoxen.

Wolf pack drives the muskoxen herd into waiting wolf.

Wolf pack member looking for food that has washed up on the ice.

Wolf pups back at the den are always waiting to be fed.

A bird feather becomes a toy for a pup at the nursery.

Scruffy, the yearling, babysits the pups at the den site.

Constant touching builds pack unity. Here 'mom' and pup have a special moment.

March 5 is first sun in five months for the arctic wolf in temperatures at -60 below 0.