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brown spider monkey
The brown spider monkey or variegated spider monkey (''Ateles hybridus'') is a critically endangered species of spider monkey, a type of New World monkey, from forests in northern Colombia and northwestern Venezuela.〔〔Emmons, L. H. (1997). ''Neotropical Rainforest Animals.'' 2nd edition. Pp. 144. ISBN 0-226-20719-6〕
Its taxonomic history has been confusing, and in the past it has been treated as a subspecies of either the Geoffroy's spider monkey or the white-fronted spider monkey.〔 Like all spider monkeys, it has very long, spindly limbs and a lengthy prehensile tail which can almost be called a fifth limb. The brown spider monkey has a whitish belly and patch on the forehead, and – highly unusual among spider monkeys – the eyes are sometimes pale blue.〔
==Physical description==
Brown spider monkeys have long and thin limbs with their forelimbs being longer than their hind limbs. They also have a distinctive long flexible, thin and prehensile tail which at times acts like a fifth limb. The tail has a highly flexible, hairless tip with skin grooves which improves grip. Their hands look slightly curvy and they have small thumbs. All these features make it possible for them to climb trees at high elevations, hang and swing from one tree to another without having to lower themselves to the ground often. Adult males weigh between and adult females weigh between . Their average adult body length is about . Their coloration ranges from light brown to dark on upper parts including the head. Their most distinctive characteristic is their whitish triangular forehead patch although not all spider monkeys have this. Some, even though unusual, possess pale blue eyes.〔(Ankel-Simons, 1999; Fleagle, 1999; Morales Jiménez, 2007; Takahashi, 2008)〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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