These mice were part of a large group relinquished by their owners because they were "oopsy babies" from a mis-sexed pet store trio.
  The males are territorial so should be kept single.
  They are all bouncy and fast but mice can live up to 4 years so they have plenty of time to calm down. These guys will probably calm down with age and become more social but for now they are fun to watch as they run on their wheels and terraform their tank.