A small monkey with conspicuous white ear tufts that feeds on tree sap and raises young with help from family members.
It has white tufts beside the ears and bands across the tail.
Common marmosets exchange calls even when they cannot see one another. In captive families, young animals often called over a parent’s voice, but these overlaps decreased as they grew. The timing of exchanges also differed depending on whether a youngster was calling with its mother, father or twin sibling.
A 2015 paper studied ten young marmosets and four parents at the University of California, San Diego, during 2010–2013. Researchers recorded pairs separated by a visual barrier from four to twelve months of age, comparing mother–offspring, father–offspring and twin–twin interactions. Parents were less likely to respond after a youngster interrupted their call than after an uninterrupted exchange.
Parent–offspring exchanges became slower and more consistently timed with age, whereas exchanges between twins did not show the same slowing. The authors proposed that parental responses could help youngsters learn the timing appropriate to each partner. Alongside producing a call, choosing when to call appears to develop through social interaction.
An extinction-risk assessment has not been added yet.
Disease surveillance and human-mediated transport are management concerns for common marmosets in Brazil. A 2022 paper analyzed rabies reports from 2008–2020, documenting infections in the native northeastern range and in Rio de Janeiro, where the species was introduced. The authors recommended limiting introductions into new areas and improving public awareness. They also emphasized avoiding messages that stigmatize marmosets and could encourage their killing.