Sentimental Facebook Version...
Not only is this sentimental, but its also a good example of anthropomorphic projection: the wolves are given human characteristics, groupthink and modes of communication.
A wolf pack: the first 3 are the old or sick, they give the pace to the entire pack. If it was the other way round, they would be left behind, losing contact with the pack. In case of an ambush they would be sacrificed. Then come 5 strong ones, the front line. In the center are the rest of the pack members, then the 5 strongest following. 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.
Real version from BBC's Frozen Planet, 2011...
A massive pack of 25 timberwolves hunting bison on the Arctic circle in northern Canada. In mid-winter in Wood Buffalo National Park temperatures hover around -40C. 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.