“Marmosets’ tails are roughly twice as long as their bodies.
The baby monkey may still be much smaller than a squirrel, but this delicate tot won’t stay pint-sized forever. One of the smallest primates, most marmosets end up 7 to 8 inches long when they’ve reached maturity after about 15 months.” *
“The Marmosets /ˈmɑrmɵsɛt/ are 22 New World monkey species of the genera Callithrix, Cebuella, Callibella, and Mico. All four genera are part of the biological family Callitrichidae. The term marmoset is also used in reference to the Goeldi’s marmoset, Callimico goeldii, which is closely related.
Most marmosets are about 20 centimetres (8 in) long. Relative to other monkeys, they show some apparently primitive features: they have claws rather than nails, and tactile hairs on their wrists. They lack wisdom teeth, and their brain layout seems to be relatively primitive. Their body temperature is unusually variable, changing by up to 4 °C (7 °F) in a day. Marmosets are native to South America and have been found in Bolivia, Brazil, Colombia, Ecuador, Paraguay and Peru.
Marmosets are highly active, living in the upper canopy of forest trees, and feeding on insects, fruit and leaves. They have long lower incisors, which allow them to chew holes in tree trunks and branches to harvest the gum inside; some species are specialised feeders on gum.
Marmosets live in family groups of three to 15, consisting of one to two breeding females, an unrelated male, their offspring and occasionally extended family members and unrelated individuals. Their mating systems are highly variable and can include monogamy, polygyny and occasionally polyandry. In most species, fraternal twins are usually born, but triplets are not unknown. Like other callitrichines, marmosets are characterized by a high degree of cooperative care of the young and some food sharing and tolerated theft. Adult males, females other than the mother, and older offspring participate in carrying infants. Most groups scent mark and defend the edges of their ranges, but it is unclear if they are truly territorial, as group home ranges greatly overlap.” **
The marmoset and other New World Monkeys are found in Central and South America.
** Source: http://en.wikipedia.org/wiki/Marmoset
Photo by: Bernd Settnik /Getty Images (I found the image with the tumblr post listed as the first source)