I have a young Mack snow Bell, I don't remember her age exactly right now but she is about 7 or 8 months. I usually give the non-adults as much food as they want and a little extra calcium and vitamines as they consume most of it in growing up, and none of them have bags but the Mack snow. I've seen many pics of Mack snows that have this bags and I was wondering if they are just prone to have them.
