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Appearance varies with species, and sometimes within species.
All spider monkeys are extremely specialized for a highly mobile arboreal lifestyle. The underside of the tail is naked and ridged like a fingerprint for added grip. It is said that even the tip of their tail can support their entire body weight. They have either no thumbs, or useless rudimentary ones, but great finger prehensibility, which is said to be an adaptation associated with semi-brachiation. Females tend to be a bit larger and heavier than males and they have an enlarged clitoris which resembles a penis.