Ask Susie Questions Answered › When do the deer turn into moose? 0 Vote Up Vote Down GuestGuide Requests Staff asked 4 years ago 1 Answers 0 Vote Up Vote Down Susie Masterson Staff answered 4 years ago Oh, this one is funny! A moose is the largest member of the deer family, but a deer will never grow up to be a moose. A deer is a deer and a moose is a moose.