Reproduction
Tamarins live in small groups of usually four to nine individuals and have some interesting reproductive traits. They give birth to twins, and only one female (the dominant individual) breeds in any single social group. The hormones present in the dominant female's urine suppress the reproductive cycles in the subordinate females of the group. Groups are polygynandrous.
Gestation for the genus Saguinus averages at 140 days. Callitrichids in general are unique in the intensity of their relations to infants. The newborns may be carried from the first day by group members other than the mother (including males in the group). Weaning occurs from 9–13 weeks, when most of the food ingested is obtained through sharing or stealing. At the juvenile stage (beginning at 4–7 months) 'twin fights' may occur, especially between same-sexed twins, to determine status differences. The sub-adult stage begins at 9–14 months, and the young animal has the size and appearance of an adult. Puberty takes place at this time but the young do not reproduce. At the adult stage (beginning at 12–21 months), sexual maturity is attained.
Read more about this topic: Golden-mantled Tamarin
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