Why is your mom suddenly against it after allowing it? Does she have to do anything to care for it, or are you taking on that responsibility? Are you paying for it, either out of your allowance, from doing odd jobs or babysitting, or ? Just wondering because as a Mom, once I've given permission for something, I don't revoke it without a very good reason - and my husband and kid needed several months to convince me to bring a snake into the house.