[2] In the past, the Peruvian, brown and white-cheeked spider monkeys have been treated as subspecies of A. belzebuth.

[1] It has a whitish belly and a pale patch on the forehead, which, despite its common name, often is orange-buff, though this might be due to dirt and other stainers.

Over the last 45 years (3 generations), the population has declined by approximately 50% due to habitat loss and hunting.

[2] White-bellied spider monkeys are important long-distance seed dispersal agents for many fruit-bearing species.

[7] When two subgroups reunite after foraging, they greet each other excitedly by vocalizing, chasing, hugging each other, and sniffing pectoral glands.

[11] White-bellied spider monkeys are believed to achieve sexual maturity at between 4 and 5 years of age and will usually produce a single offspring although females giving birth to twins has been reported.

[14] The diet of White-bellied spider monkeys is 83% mature fruits and they are important to the seed dispersal of many fruit-bearing species.

[15] They also are likely to return to previous food sources and spend relatively little time foraging.

[16] They will also feed on other plant parts such as leaves, flowers, and bulbs, and will very rarely consume small insects.

This tail allows for additional grasping of branches, which means there is less lateral movement while brachiating which increases efficiency.