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Their movements in the branches are extremely speedy.Huge groups of tiny monkeys: They live together in multi-male/multi-female groups with up to 500 members.The feet, hands, and forearms are a light yellow (Groves 2001).
Males and females are similar heights, 310 mm (12.2 in) on average, but males are heavier than females, weighing between 9 g (2.12 to 2.4 lb), depending on the season while females weigh between 700 and 900 g (1.54 to 1.98) (Rowe 1996).
The black squirrel monkey, , gets its name from the black band from the crown to the tail.
The gray or black fur on their head makes a very shallow "V" pattern between their eyes (Groves 2001).
subspecies are predominantly orange to golden-orange over their backs, hands, feet, and forearms while the crown fur is blackish in females or blackish-brown in males.
Small monkeys, big brains: Squirrel monkeys grow to 25 to 35 cm, plus a 35 to 42 cm tail. Remarkably, the brain mass to body mass ratio for squirrel monkeys is , which gives them the largest brain, proportionately, of all the primates. Speedy, daytime tree huggers: Like most of their New World monkey relatives, squirrel monkeys are diurnal and arboreal.
Unlike the other New World monkeys, their tail is not used for climbing, but as a kind of "balancing pole" and also as a tool.Female squirrel monkeys reach sexual maturity at age 3 years, while males take until age 5.They live to about 15 years old in the wild, about 20 years in captivity.Squirrel monkeys are now divided into two groups, the .Most of the literature and information available on squirrel monkeys does not make these newer distinctions and focuses on the traditional taxonomy with only two species (Groves 2001).Death head monkeys: Squirrel monkey fur is short and close, colored olive at the back and yellowish orange on its belly and extremities.Their throat and the ears are white and their mouths are black. This black and white face gives them their German name, "death's head monkeys".Even though there are slight morphological differences among squirrel monkey species, all have the same general facial and body colorations and are easily distinguished as part of the genus.Squirrel monkeys have white masks of fur around their eyes and dark brown or black coloration around the mouth and chin.These large groups can, however, occasionally break into smaller troops.These areas they live are moist tropical forests, and they usually forage in the medium and lower levels of the forest and sleep close to the canopy. Traveling with other animals: It is common to see these squirrel monkeys in mixed groups, moving along with other primate species and birds.