Located between 1 degree north and 13 degrees south latitude in the northern Amazon forests, Callimico goeldii can be found in southern Colombia, eastern Ecuador, eastern Peru, western Brazil, and northern Bolivia. They are dark brown or black with possible white areas on and around the face.
Adults have pale rings on the tail.
The diet of Callimico goeldii consists primarily of fruits, insects, and small vertebrates. A group of Goeldi's monkeys will travel and feed in fruiting trees. Competition for fruit seems not to be a problem. They hunt individually, leaping to the ground to obtain small verebrates. Reproduction Female Callimico goeldii normally give birth to single offspring.