Direttamente da wikipedia:
A lone wolf is a wolf that lives by itself rather than with others as part of a pack. Lone wolves are typically old specimens driven from their pack or young adults in search of new territory. Instead of openly challenging the leadership of the pack leaders, most young wolves between the ages of 1-4 years leave their family in order to search for a pack of their own. Though it is shown that some wolves will simply remain lone wolves As such lone wolves are usually stronger, more aggressive and far more dangerous than the average wolf that is a member of a pack. They have difficulty hunting, as wolves’s favorite prey are large ungulates, and it is nearly impossible for a wolf to bring one down by itself (hunting on their own can be done, as lone wolves are naturally stronger and some specialise in hunting moose on their own). Instead, they will hunt smaller animals and scavenge. Sometimes, a lone wolf will find another lone wolf of the opposite sex, and the two will start a new pack.