This species of monkey is quite popular with humans. The Facial appearance of white fronted capuchin in time spent looking at the pictures indicates that red-fronted lemurs are able to discriminate between the pictures of conspecifics and heterospecifics. American Journal of Physical Anthropology. Capuchins have a proportionately larger brain than Mantled Howlers. One of the smaller species of capuchin lives in the jungles in northwestern South America in Ecuador, Colombia, parts of the Brazilian Amazon and Peru. Hence, eulemur females exhibiting a polymorphic trichromacy have the ability to perceive red and orange colors [ 61 ], and may therefore have shown a more pronounced differentiated response than males.