The Pygmy Marmoset is also called Dwarf Monkey.
It is a New World monkey native to the rainforest canopies of eastern Ecuador, western and southeastern Colombia, Brazil, eastern Peru, and northern Bolivia.
As one of the smallest primates, it is the smallest true monkey and its body length ranging from 14 to 16 centimetres (excluding the 15-to-20-centimetre tail).
Females weigh only 120 grams while Males weigh around 140 grams.
Although its name is normal, it is somewhat different from the typical marmosets.
Most of them are classified in the genera Mico and Callithrix.
Some nicknames for it such as leoncito ("little lion") and mono de bolsillo ("pocket monkey") often refer to its diminutiveness.
As a fictional animal perpetuated by edited internet images, it is not to be mistaken for a 'thumb monkey.
' It gives alerts and warning to its family members with special types of communication.
These include vocal, physical and chemical types of communication.
For example, a trill is used to communicate over long distance and a clicking sound signal danger to their family members while a sharp warning whistle.
The caller repeated a series of fast notes called J-call at medium distances.
They can live into their early twenties in zoos while 11-12 years in the wild.
They often live in groups.
These groups, which range from 2-6 members, are made up of an adult pair and its offspring.
It is native to the tropical forests of South America.
They have unique ways of communication and are extremely social mammals.
It could be difficult to keep this monkey as pets, but if done so properly, it can be extremely rewarding.
Its tail length varies from 172-229 mm, or about 13 inches on average and Its head and body length varies from 117-152 mm.
It is the world's smallest monkey.
The adult weight is approximately four ounces on average or only 85-140 grams.
It is one of the cutest primates on this planet, although they are even smaller than a soda can.
They are so cute that many people are interested in them for pets.
It usually has a ringed tail that is as long as its body and a tawny coat.
Although a lifespan of 15 years has been recorded before, they usually have a lifespan of about 6-9 years in captivity.
We don't know much about native lifespan of them.
They are not endangered but are in danger of becoming endangered, so they are filed as least concerned under the endangered species categories.
This is because of habitat destruction mainly.
It is also extremely adaptable to its environment, which perhaps is one reason why they are not endangered yet.