It has something to do with our eco system and how we have already wrecked it with the introduction of other small creatures (namely rabbits unfortunately
) and now the government has a legislation about importing 'rodents'. We arent allowed HEAPS of small pets... Hammies, gerbils, chins, degus, hedgies and loads more. We really only have buns, mice, rats, guinea pigs and ferrets and they arent even allowed in every state.