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any of five species of densely furred South American primates found in rainforests of the western Amazon River basin. Woolly monkeys average 40-60 cm (16-24 inches) in length, excluding the thick and somewhat longer prehensile tail. Females weigh 7 kg (15.5 pounds) on average, males a little more. The common, or Humboldt's, woolly monkeys (Lagothrix lagotricha and related species) have short fur that, depending on the species, is tan, gray, reddish, or black; some have darker heads. The head itself is large and round, with a bare black or brown face. Their bodies are thick with sturdy limbs, and their protruding bellies have given them the Portuguese name barrigudo, or "big belly."