The Black Spider Monkey occurs in the tropical rainforests of South and Central America. Its trunk is relatively short compared to the length of it hind limbs and even longer forelimbs. Longer than the monkey's entire body, the prehensile tail sports a friction pad on its distal section, which is useful for grabbing. The high level of sensitivity and flexibility of the tail is reflected in the structure of its vertebrae. Its hands possess very small or absent thumbs.