What specific coloration marks the tail of the Yellow-tailed woolly monkey (*Oreonax flavicauda*)?
Answer
Distinctive yellowish pelage on the underside of the final section of the tail.
The Yellow-tailed woolly monkey derives one of its names from a specific marking on its tail. While its main body fur is described as deep mahogany or copper, the final section of the tail carries a distinguishing feature: a characteristic yellowish coloration situated on the underside of that terminal portion. This specific yellowish feature is explicitly noted as being absent in juveniles of the species, indicating it develops as the animal matures.
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