The Monkey with a Bright Blue Bottom

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Dominant or alpha male mandrills have the most mating success. Upon gaining alpha status, males develop larger testicles, redder faces and posteriors, more secretion from the chest glands and fatter sides and rumps. When a male loses dominance, these physiological changes are at least partially reversed. [31] The blue facial skin is more consistent in brightness. [31] [60] Higher ranking males tend to have more contrast between red and blue facial coloring. [33] Due to their distribution of fat, dominant males are also known as "fatted" males while subordinate males are known as "non-fatted" males. [61] Canine length also correlates with dominance, and males are less likely to sire offspring when their canines are under 30mm (1.2in). [22] In some individuals, the development of secondary sexual characteristics is suppressed in response to competition from other males. [55] Male mandrills tend to establish dominance with vocalizations and facial expressions, rather than fighting. [62] The vibrant coloration of monkey butt has intrigued scientists for decades. These bright hues are not just visually striking but serve essential functions.

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. 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. Monkeys, like many primates, use sexual swellings to indicate fertility. The increased hormonal activity around the genitals during ovulation causes the skin to turn pink, a phenomenon known as tumescence. The Science Behind The Monkey Butt Vibrant Coloration? Yin, Y.; Yang, T.; Liu, H.; etal. (2020). "The draft genome of mandrill ( Mandrillus sphinx): An Old World monkey". Scientific Reports. 10 (1): 2431. Bibcode: 2020NatSR..10.2431Y. doi: 10.1038/s41598-020-59110-3. PMC 7016171. PMID 32051450.

a b Telfer, P. T.; Souquière, S.; Clifford, S. L.; etal. (2003). "Molecular evidence for deep phylogenetic divergence in Mandrillus sphinx". Molecular Ecology. 12 (7): 2019–2024. doi: 10.1046/j.1365-294x.2003.01877.x. PMID 12803651. S2CID 11511844. Schino, Gabriele; Pellegrini, Barbara (2011). "Grooming and the expectation of reciprocation in mandrills ( Mandrillus sphinx)". International Journal of Primatology. 32 (2): 406–414. doi: 10.1007/s10764-010-9477-4. S2CID 2899244.

Bear was friendly, Bear was sweet, The nicest bear you'd ever meet! With little paws and little feet, And a very BIG bear bottom! Poor Bear! His bottom is causing chaos... Bump! Crash! Splat! Soon Bear is in great big trouble! Can he ever make it up to his friends? I started working as an illustrator when I was in my final year at Art College and now, over 28 years later I still haven't got a proper job! I've illustrated literally hundreds of books, predominantly in educational publishing. A few years ago I was main illustrator for Longman's 'Story Street' reading scheme, illustrating 79 titles and writing 5.In the picture above, both the red and blue photons bounce (scatter) 4 times while they are penetrating the skin. But because the red photons travel a longer distance in between scattering events, they manage to penetrate both layers of skin. The melanin in Tissue B absorbs the red photon so it can’t leave the skin and reach your eye. Lesula is an Old World monkey species living in the Congo‘s Lomami Basin. This monkey has startlingly characteristic human-like eyes and a blue bottom. Though the international scientific community was unaware of its existence until 2007, the local population was aware of its presence for some time. Goods that by reason of their nature, cannot be returned - (Items such as underwear, where the 'hygiene patch' has been removed, or cosmetics where the seal has been broken). Dirks, W.; Lemmers, S. A. M.; Ngoubangoye, B.; Herbert, A.; Setchell, J. M. (2020). "Odontochronologies in male and female mandrills ( Mandrillus sphinx) and the development of dental sexual dimorphism". American Journal of Physical Anthropology. 172 (4): 528–544. doi: 10.1002/ajpa.24094. PMID 32510604. S2CID 219539657. 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.