(Also a mature un-neutered or recently neutered male will also have a bald looking spot on top of his head)
In breeding Sugar Gliders there is alot to think about. The extra cages and space for them, food, supplies, vet bills, time and energy to care for a large number of Gliders, and being tied down or finding someone to care for them while your away etc. People can find themselves having to take care of rejected joeys, or a lot of joeys that they can not find homes for. It can be rewarding experience. But it also can be up-setting when a joey is killed and cannibalized by it's own parents. It is NOT a PROFITABLE BUSINESS if you are thinking that you can make money at. You would need a LARGE NUMBER of breeding pairs, as they usually only have 1 to 2 joeys 2 to 3 times a year.