It is one of the largest New World monkeys, often weighing as much as 9 kilograms. Its arms are significantly longer than its legs, and it has a prehensile tail that can support the entire weight of the monkey and that is used as an extra limb. Its hands have only a vestigial thumb, but long, strong hook-like fingers. These adaptations allow the monkey to move by swinging by its arms beneath the tree branches."
"females are sometimes mistaken for males by human observers.[15]"
"Although they do not use tools, spider monkeys, including Geoffroy's Spider Monkey, are regarded as intelligent primates.
A study performed in 2007 concluded that spider monkeys were the third most intelligent non-human primate, behind only orang-utans and chimpanzees, and ahead of gorillas and all other monkeys.[22]
This mental capacity may be an adaptation to spider monkeys' frugivorous diets, which require them to be able to identify and memorize many different types of foods and their locations.[23]"
http://en.wikipedia.org/wiki/Geoffroy%27s_Spider_Monkey
A pink element in the above picture would be the lips/mouth of the baby monkey in the lower-left image, I guess. :)
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