I went to visit a budgie breeder who has about 15 different coloured budgies. I also noticed he had 2 or 3 rainbow budgies. I think he bred them himself. Are rainbow budgies rare? If so, how come he has some because I've read that rainbow budgies are the result of something going wrong in the egg. It just seems strange that he has so many, compared to the total number of budgies he has.