Applicability of cancellation rights: Legal rights of cancellation under the Distance Selling Regulations available for UK or EU consumers do not apply to certain products and services. To understand how photons move through a complex tissue like skin, lets compare a red photon with a blue photon as it hits two tissue layers. Tissue “A” is on top, and Tissue “B” is underneath. If layers A and B were both white (like milk), they would reflect red and blue photons equally and you would see both colors. The mandrill ( Mandrillus sphinx) is a large Old World monkey native to west central Africa. It is one of the most colorful mammals in the world, with red and blue skin on its face and posterior. The species is sexually dimorphic, as males have a larger body, longer canine teeth and brighter coloring. It is the largest monkey in the world. Its closest living relative is the drill, with which it shares the genus Mandrillus. Both species were traditionally thought to be baboons, but further evidence has shown that they are more closely related to white-eyelid mangabeys.

Setchell, J. M.; Dixson, A. F. (2002). "Developmental variables and dominance rank in adolescent male mandrills ( Mandrillus sphinx)". American Journal of Primatology. 56 (1): 9–25. doi: 10.1002/ajp.1060. PMID 11793410. S2CID 25762754. Researchers remain intrigued by this species’ eyes that strongly resemble its human cousins. Some primatologists speculate that this primate’s blue bottom is also valuable for attracting mates. However, the exact reason for the blue butt is still unknown. Nevertheless, the lesula is a fascinating new monkey species that will continue generating interest and excitement among scientists and laypeople. Blue-Butt Vervet Monkeya b c Ankel-Simons, F. (2007). Primate Anatomy: An Introduction (3rded.). Elsevier Acad Press. p.128. ISBN 978-0-08-046911-9. A baboon’s butt tissue is arranged somewhat like the illustration above so that blue photons are reflected and all of the other photons (like the red ones) are absorbed. Only the blue light makes it out and gets into our eyes. This is why we see we see blue monkey butts! The research was supported by the Arcus Foundation, the US Fish and Wildlife Service, a grant from Edith McBean, Abraham Foundation, Margot Marsh Biodiversity Foundation Grant, and Yale Institute for Biospheric Studies. Researchers from Florida Atlantic University, New York University, Columbia University, the Lukuru Wildlife Research Foundation, and the Centre de Formation et Conservation Forestière are co-authors of the paper. The different colors of the primate’s butt come from the arrangement of the tissue in the area, reflecting specific light wavelengths. Therefore, mandrills have blue butts, while other monkeys have pink, red, or bright blue bottoms because of tumescence, which occurs due to the hormones produced during ovulation.

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] Prum, Richard O.; Torres, Rodolfo H. (2004). "Structural colouration of mammalian skin: Convergent evolution of coherently scattering dermal collagen arrays" (PDF). Journal of Experimental Biology. 207 (12): 2157–2172. doi: 10.1242/jeb.00989. PMID 15143148. S2CID 8268610. The sale of customised goods or perishable goods, sealed audio or video recordings, or software, which has been opened. Red butts in monkeys and other primates serve various purposes, including indicating fertility and social status. It’s fascinating that some monkeys have more vibrant and colorful butts than others. While some, like the mandrills, have multicolored bums, others, like the Celebes crested macaque, have outrageously swollen and bright red butts.Mandrills are noted for being among the most colorful mammals. Charles Darwin wrote in The Descent of Man: "no other member of the whole class of mammals is coloured in so extraordinary a manner as the adult male mandrill". [30] The red coloration is created by blood vessels near the surface of the skin, [31] while the blue is a form of structural coloration caused by parallel arrangements of collagen fibers. [32] The blue ridges on males contrast with both the red facial hues and the green foliage of their environment, helping them stand out to other individuals. [33] The darker and more subdued coloring of female faces is caused by melanin. [34] Ecology [ edit ] Female mandrill sitting in tree a b c d Harrison, M. J. S. (2009). "The mandrill in Gabon's rain forest-ecology, distribution and status". Oryx. 22 (4): 218–228. doi: 10.1017/S0030605300022365.

Vaglio, S.; Minicozzi, P.; Romoli, R.; etal. (2016). "Sternal gland scent-marking signals sex, age, rank, and group identity in captive mandrills". Chemical Senses. 41 (2): 177–186. doi: 10.1093/chemse/bjv077. PMID 26708734. Setchell, J. M. (2005). "Do female mandrills prefer brightly colored males?" (PDF). International Journal of Primatology. 26 (4): 715–735. doi: 10.1007/s10764-005-5305-7. S2CID 3082991.a b c Sabater Pi, J. (1972). "Contribution to the ecology of Mandrillus sphinx Linnaeus 1758 of Rio Muni (Republic of Equatorial Guinea)". Folia Primatologica. 17 (4): 304–319. doi: 10.1159/000155442. PMID 4624917. As of 2019, the IUCN Red List lists the mandrill as vulnerable. Its total population is unknown but is suspected to have decreased by more than 30 percent over the last 24 years. Its main threats are habitat destruction and hunting for bushmeat. [1] The mandrill appears to have suffered massive habitat loss in Equatorial Guinea and southern Cameroon, while its range in the Republic of the Congo is limited and its status is unknown. [79] In addition, while mandrills live in groups numbering in the hundreds, hunting in Cameroon and Equatorial Guinea appears to have led to smaller group sizes. [1] Gabon is seen as the most important remaining refuge for the species, and the country's low population density and vast rainforests make it a good candidate for mandrill conservation. Surveys have shown high population numbers for other primate species like chimpanzees and gorillas. A semi-wild population exists at the International Centre of Medical Research of Franceville. [80] The Rhesus Macaque, also known as the red bottom monkey, is a species of Old World monkey native to Asia. These monkeys have distinctive reddish-brown fur and long tails, are social and live in groups of up to 30 individuals. Females reach sexual maturity at around three years, while males reach maturity at approximately four years. Rhesus macaques typically mate during the summer months. After a gestation period of 155 days, the female will give birth to a single infant. Females are characterized by their very red bottoms, which are essential to mate choice. Studies also show that females with redder bottoms are more likely to acquire a mate. Celebes Crested Macaque I've been writing children's books for about 6 years and have already had several picture books published with more in development. They are classified as monkeys because they have tails. Apes, on the other hand, do not have tails. What Monkey has a Colorful Bottom?