Pelvic sexual dimorphism and relative neonatal brain size really are related. Big-bodied males help us recognize that females have big pelves. Sexual dimorphism and allometry in primate ossa coxae. Sexual dimorphism in the size and shape of the os coxae and the effects of microevolutionary processes. The primate pelvis: allometry or sexual dimorphism? J. The evolution of modern human childbirth. Evolution of the human pelvis and obstructed labor: new explanations of an old obstetrical dilemma. Functional aspects of pelvic morphology in simian primates. Humans as inverted bats: a comparative approach to the obstetric conundrum. Expanding the evolutionary explanations for sex differences in the human skeleton. The reliability of sex determination of skeletons from forensic context in the Balkans. Sex differences in the sciatic notch of great apes and modern humans. Accuracy of sex determination using morphological traits of the human pelvis. Sexual dimorphism in the human bony pelvis, with a consideration of the Neandertal pelvis from Kebara cave, Israel. Sex differences in the pelves of primates. Developmental evidence for obstetric adaptation of the human female pelvis.

Allometry and sexual dimorphism in the human pelvis. Covariation between human pelvis shape, stature, and head size alleviates the obstetric dilemma. We further suggest that this shared pattern was already present in early mammals and propose a hypothesis of facilitated variation as an explanation: the conserved mammalian endocrine system strongly constrains the evolution of the pattern of pelvic differences but enables rapid evolutionary change of the magnitude of sexual dimorphism, which in turn facilitated the rapid increase in hominin brain size.įischer, B. We conclude that this pattern of pelvic sex differences did not evolve de novo in modern humans and must have been present in the common ancestor of humans and chimpanzees, and thus also in the extinct Homo species. Even though the magnitude of sex differences in pelvis shape was two times larger in humans than in chimpanzees, we found that the pattern is almost identical in the two species. Here we compare pelvic sex differences across modern humans and chimpanzees using a comprehensive geometric morphometric approach. Still I’m voting for that monkey is fake, odd tho ya brought this up as i stumbled across that pic myself sometime ago pondered it for a while and then went on with my random internet exploration.It is commonly assumed that the strong sexual dimorphism of the human pelvis evolved for delivering the relatively large human foetuses. Personally I’ve never even met a chimp just a couple of monkeys here and there and lots of humans. However, I can’t swear to the skin color of other primates. Nina Jablonski, an expert on the evolution of skin color at the California Academy of Sciences.” So the prototype hominid too probably had fair skin under dark hair, said Dr. “Chimpanzees have pale skin and are born with pale faces that tan as they grow older. I’ve always been fascinated with human evolution so I kinda knew that but a google search reveals several sources that fact. My last employer falls under that category… sadly for him i might add.Īnyway the great apes all have light skin not dark as commonly thought. Most primates are not, people included unless they try to be!!Īs to humans being hairless actually we are not, we are covered in hair, usually a very fine “fuzz” but in some of the more unfortunate usually males of our species it is quite clearly FUR. It is just too muscular looking to look real to me. It could be some kind of birth defeat or illness but I still think it is fake. tho honestly it is kinda hard to tell, I truly hope tho it is not a monkey someone shaved or whatever. Hmmm when i first saw that photo I thought it was fake, man made, something along the lines of a Gargoyle perhaps.

Female chimpanzee hairless