In the animal kingdom, lone wolves are typically older wolves driven from the pack, perhaps by the breeding male, or young adults in search of new territory. Many young wolves between the ages of 1 and 4 years leave their family to search for a pack of their own in order to prevent inbreeding, as in typical wolf packs there is only one breeding pair. Some wolves will simply remain lone wolves; as such, these lone wolves may be stronger, more aggressive and far more dangerous than the average wolf that is a member of a pack. Occasionally, a lone wolf will encounter another lone wolf of the opposite sex, and the two may start a new pack.