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The tail is used like a third hand as the monkeys move rapidly through trees
The thumbs are absent or poorly-developed, thus their hands and long fingers are used as hooks to swing on branches
They get their name from their spider-like appearance, due to their disproportionately long limbs and long prehensile tail.
Spider monkeys live and move agilely through the small branches of the high forest strata using their four limbs and tail to grasp.
They are entirely day active and live in groups of variable size, depending on the availability of food. Where fruit trees are small and scattered, groups of only two to five animals are seen, but where food is more abundant they live in groups of up to 30.
Spider monkeys are omnivores whose diet consists mainly of fruit (80%) but also includes leaves, nuts, seeds, bark, insects, and flowers. They contribute to the dispersion of undigested seeds from the fruits they eat.
After a gestation period of 226-232 days the female gives birth to a single baby which is carried by the mother until it first leaves her at 10 weeks.
A mother carries her infant around on her belly for the first month after birth. After this she carries it on her lower back. The infant wraps its tail around its mothers and tightly grabs her midsection.
Mothers are very protective of their young and are generally attentive, while males are not involved in raising the young.