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In page Sugar glider:

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Territory and members of the group are marked with saliva and a scent produced by separate glands on the forehead and chest of male gliders. Intruders who lack the appropriate scent marking are expelled violently.[3] Rank is established through scent marking; and fighting does not occur within groups, but does occur when communities come into contact with each other.[4] Within the colony, no fighting typically takes place beyond threatening behaviour.[5] Each colony defends a territory of about 1 hectare (2.5 acres) where eucalyptus trees provide a staple food source.[citation needed]