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The brown spider monkey, Ateles hybridus, is a species of spider monkey, a type of New World monkey, from South America. It is found in Colombia and Venezuela. Like all spider monkeys, it has very long, spindly limbs and a lengthy prehensile tail which can almost be called a fifth limb. The tail is made up of highly flexible, hairless tips with skin grooves which improves grip on tree branches and is adapted to its strictly arboreal lifestyle. It is currently critically endangered, with few examples of them remaining in the wild.