The smallest monkey and yet not the smallest primate?
Pygmy marmosets reach a head to barrel length of 12-15cm and a weight of 100-120g. Therfore, they are still larger than e.g. mouse lemurs which is the smallest primate but are not counted as real monkeys. A group of pygmy marmosets consists of a couple and their (even adult) offspring. To avoid inbreeding the dominant couple suppresses reproduction of the other group members by hormones and aromatic substances.
Age: up to 12 years
Sexually mature: at 2 years
Reproduction: mostly twin births
gestation period: 133-140 days
food: tree sap, insects, spiders
habitat: tropical rainforests, especially temporarily flooded lowland rainforests
Danger: not endangered
distribution: Western Amazon Basin between Rio Japurá in the North and Rio Madeira in the East and south = parts of W-Brazil, S-Colombia, O-Ecuador, O-Peru and N-Bolivia