After their first coincidental encounter with the captive Lesula, the Harts and their research team observed it in the wild, documented its behavior and ecology, and ultimately determined its distinctiveness through genetic and anatomical studies. The Lesula is known to live exclusively within only 17,000 square kilometers of mature evergreen forests in DRC’s eastern central basin, between the middle Lomami and upper Tshuapa rivers. Groves, Colin P. (1982). "Primates; Simiiformes; Catarrhini; Cercopithecoidea; Cercopithecidae; Cercopithecinae". In Wilson, Don E.; Reeder, DeeAnn M. (eds.). Mammal Species of the World: A Taxonomic and Geographic Reference. Volume 1. Johns Hopkins University Press. p.162. ISBN 0-8018-8221-4.

a b Renoult, J. P.; Schaefer, H. M.; Sallé, B.; Charpentier, M. J. E. (2011). "The evolution of the multicoloured face of mandrills: Insights from the perceptual space of colour vision". PLOS ONE. 6 (12): e29117. Bibcode: 2011PLoSO...629117R. doi: 10.1371/journal.pone.0029117. PMC 3244440. PMID 22216180. The structure of the mandrill’s butt tissue reflects blue photons and absorbs other colors, making the blue color more visible. What monkey has a pink bum? You can think of a photon as a drunk person walking through a forest. The drunk person enters the forest and walks into a tree, D’oh!, changes direction (scatters) and walks another short distance and into another tree, D’oh! D’oh! D’oh! D’oh! …. and before you know it the drunk person exits the forest in a random place going a random direction.Mandrills are large primates closely related to the baboon. These animals inhabit the tropical forests of Africa and are monkeys with blue butts. Additionally, the mandrill is the largest non-ape primate. It is arguably the most colorful, with a trademark bright red and blue face and a very bright and colorful butt. These are secondary sexual characteristics, present in both sexes but much more vibrant in males. Scientists believe that they use this feature to attract mates and intimidate rivals. Some authorities have divided mandrill populations into subspecies: the northern mandrill ( M. s. sphinx) and the southern mandrill ( M. s. madarogaster). A proposed third subspecies, M. s. insularis, was based on the mistaken belief that mandrills are present on Bioko Island. [14] [15] The consensus is that mandrills belong to one subspecies ( M. s. sphinx). [16] Mandrill gestation lasts an average of 175 days with most births taking place between January and March, during the wet season. Gaps in between births range from 184 to 1,159 days with an average of 405 days. [70] and tend to be shorter in higher ranking females. [71] Infants are born at an average weight of 640g (23oz), and mostly bare-skinned with some white hair and a tuft of dark hair on the head and along the spine. Over the next two or three months, they develop their adult hair color on the body, limbs and head while the flesh-colored face and snout darken. [72] Dependent infants are carried on their mothers' bellies. [73] [51] Young are typically weaned at around 230 days old. Males become more sexually dimorphic between four and eight years old, at which point females are already beginning to give birth. [54] Males start leaving their horde after they reach six years old. [51] Females reach their adult size around seven years while males do so at ten years. [54] Communication [ edit ] Female mandrill facepalming Red bottoms in female monkeys signal to the males that they are ready to mate. In some species of monkeys, such as the mandrill, males have colorful butts that indicate their social status. Why are baboon’s butt red? a b Kudo, H.; Mitani, M. (1985). "New record of predatory behavior by the mandrill in Cameroon". Primates. 26 (2): 161–167. doi: 10.1007/BF02382015. S2CID 20928597.

Bret, C.; Sueur, C.; Ngoubangoye, B.; Verrier, D.; Deneubourg, J.-L.; Petit, O. (2013). "Social structure of a semi-free ranging group of mandrills ( Mandrillus sphinx): A social network analysis". PLOS ONE. 8 (12): e83015. Bibcode: 2013PLoSO...883015B. doi: 10.1371/journal.pone.0083015. PMC 3858359. PMID 24340074. Pourquoi stories” are ones which give explanations for the origins of animals, and also some of their characteristics. They are present in many different cultures, and are often now told to entertain. This one fits the bill perfectly. Just why is it that some monkeys have startlingly coloured faces - and rear ends? This book offers an explanation why. The vibrant coloration of monkey butt has intrigued scientists for decades. These bright hues are not just visually striking but serve essential functions. Pansini, R.; de Ruiter, J. R. (2011). "Observation of tool use and modification for apparent hygiene purposes in a mandrill". Behavioural Processes. 88 (1): 53–55. doi: 10.1016/j.beproc.2011.06.003. PMID 21740959. S2CID 38857295. The mandrill has the most colorful bottom of any primate. Both males and females have brightly colored faces and butts, and high-ranking males display the most vibrant colors. Is There a Monkey with a Blue Bottom?They are classified as monkeys because they have tails. Apes, on the other hand, do not have tails. What Monkey has a Colorful Bottom?