Quarantine officials are concerned that the bulk importation of frozen house mice and other animals as food for pet snakes and owls may spread infectious diseases, it was learned Monday.&br;Many people copy Harry Potter," said an official at Tsukiyono Farm in Tsukiyono, Gunma Prefecture, which raises house mice in a sterilized facility. &br;"We have an increasing number of customers who keep owls. Demand for mice as their food is rising," he added. &br;&br;Read more here