Males help care for and carry the young. Carrying the young for the first six to eight weeks of life is very important. The nursing period usually lasts about two to three months and sexual maturity is achieved at about 24 months. Behavior Saguinus geoffroyi is diurnal and is usually found in groups of 2-19 individuals. They are a territorial species that has been found to visit the border of their range and mark the trees early in the morning each day .
Males usually visit the border most often.
Sex roles are very different when it comes to territorial disputes. Males usually act aggressively with other groups whereas females usually just scent mark. S. geoffroyi makes a variety of birdlike calls that serve as alarms for others in the group when danger from raptors or ground dangers, such as snakes or coatimundis, arise . Habitat Saguinus geoffroyi lives in an area of shrubbery, grasses and secondary growth. This species often lives in disturbed forests and has been historically associated with slash and burn agriculture.