Pygmy Marmoset

Nicknames for this monkey often refer to its diminutiveness, for example: mono de bolsillo ("pocket monkey"), leoncito ("little lion"), and finger monkey.
The pygmy marmoset uses special types of communication to give alerts and warning to its family members. These include chemical, vocal, and physical types of communication. A trill is used to communicate over long distance. A sharp warning whistle and a clicking sound signal danger to their family members. A J-call is a series of fast notes repeated by the caller and is used at medium distances.
Pygmy marmosets live 11-12 years in the wild, but in zoos, they live into their early twenties. Marmosets often live in groups made up of an adult pair and its offspring; ranging from 2-6 members. Young marmosets typically remain in the group until after 2 consecutive birth cycles.