Goeldi’s Marmoset

Goeldi's Marmoset

The Goeldi’s Marmoset (Callimico Goeldii), is a New World Monkey in the Callitrichidae family of monkeys and can be found in upper Amazon basin near Bolivia, Brazil, Colombia, Ecuador, and Peru. The Goeldi’s Marmoset is black or blackish-brown in color, accented by red, white, and silvery highlights on their heads and tails. They are the only species in the world in the genus Callimico, and as such are frequently referred to as “Callimicos” monkeys. It is one of the most threatened species of Marmosets in South America, unfortunately earning a “vulnerable” rating on the conservation status scale.


The Goeldi’s Marmoset prefers to forage in dense scrubby undergrowth, which lends to the rarity of sighting this majestic monkey. The live in very small social groups compared to many other types of Marmosets, scattered throughout the upper Amazon Basin in the areas surrounding Bolivia, Brazil, Colombia, Ecuador, and Peru in groups of approximately six monkeys.


In the wet season, the diet of the Goeldi’s Marmoset includes fruit, insects, spiders, lizards, frogs, and snakes. During the dry season, they predominately feed on fungi. Goeldi’s Marmoset’s are the only tropical primates known to depend on this source of food, which makes them very unique compared to other types of Marmosets; which typically feed on exclusively plant exudates, small insects, and other small vertebrates.

Fun Goeldi’s Marmoset Facts

  1. Goeldi’s Marmoset mothers carriy a single baby monkey per pregnancy, whereas most other types of Marmosets usually give birth to twins.
  2. Goeldi’s Marmosets are the only member of the Callimico genus, which is why they are sometime called “Callimicos” monkeys.
  3. Female Goeldi’s Marmosets outnumber males by a ratio of 2 to 1.
  4. The mothers act as the primary caregiver for the first 2-3 weeks of their baby’s life, then the father takes over most of the responsibilities except for nursing.