Last is alone, the alpha. He controls everything from the rear.
In that position he can see everything, decide the direction. He sees all of the pack.
The pack moves according to the elders pace and help each other, watch each other. A massive pack of 25 timberwolves hunting bison on the Arctic circle in northern Canada.
The wolf pack, led by the alpha female, travel single-file through the deep snow to save energy. The size of the pack is a sign of how rich their prey base is during winter when the bison are more restricted by poor feeding and deep snow. The wolf packs in this National Park are the only wolves in the world that specialize in hunting bison ten times their size.
They have grown to be the largest and most powerful wolves on earth. The sky was dark with no hint of stars.