This picture also went viral with a description that someone simply made up. Allegedly, the first 3 wolves in the pack are the oldest and the weakest, and next 5 are the strongest, in the middle there is the rest of the pack, and 5 more strong animals are in the back. The last one is the leader that controls the situation.
However, the photographer Chadden Hunter explained that this is how a pack of wolves hunts a bison, and in the front, there are no weak animals, just the alpha male.