During mating season, the males contest for female attention through ‘stink fights’. Coating their entire tail with smelly secretions from their scent glands, they wave it high in the air, each trying to outstink rival males. Males, especially dominant ones also waft their 'scented’ tail at females to attract them.
Males move between troops every 2-5 years. Many leave their parents’ troops as subadults to join other groups but reality bites. They must fight their way to become one of the top males - lowly-ranked males get smacked around a lot by the females.