Male sugar gliders have a scent gland in the middle of the top of their head, which causes the typical bald spot in the center of the wide part of the black stripe there. Another gland is located in the middle of their chest. A third gland, an anal one, is shared by males and females alike. The females also have a scent gland in their pouch. The male's forehead and chest glands are used in marking his territory and his mates with his scent.
Gliders produce at least three distinct odors.
It can get relatively strong at times, when they are breeding, but after a few days it dies away again. The third is a pungent smell that is produced by the anal gland when a glider is afraid. Gliders use urine to mark their territory, so you will need to clean their cages and furnishings periodically. Otherwise though, they are very clean little animals. See the housing section for more on the topic of cages.