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any of more than 20 species of widely distributed African monkeys characterized by bold markings of white or bright colours. Guenons are slim, graceful quadrupedal monkeys with long arms and legs, short faces, and nonprehensile tails that are longer than the combined head and body length of about 30-65 cm (12-26 inches). Males of the large species weigh over 9 kg (20 pounds) and females as much as 5 kg; males of the smaller species are only 4 kg, females 2.5 kg. Guenons are known for the beauty of their soft, dense fur, which in many species has a speckled appearance produced by the alternation of two colours along each hair shaft. The bodies of guenons are commonly grayish, reddish, brown, green, or yellow.