why is the lack of "fur" positive Progression for humans?

Which explains why all the animals in Africa are covered in fur, and the male human is hairier than the female. Or are you saying that humans can run faster than animals and women did all the hunting?? Ever tried that with a horse?Sorry but this "explanation" just does not add up.Enjoy.Edited by RAZD, : dimorphism is part of the equation

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Which doesn't explain the sexual dimorphism in hairiness.It was probably more likely propelled by sexual selection for younger more childlike appearance in mates.See Sexual Selection, Stasis, Runaway Selection, Dimorphism, & Human Evolution for another view on this subject. I wouldn't be surprised to find that the first hominid ancestor that was "bare" appearing predates the formation of the savanna ecology in africa.Enjoy.

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It may surprise you to learn that we have as many hair follicles as a ape would have for our body size. See Sexual Selection, Stasis, Runaway Selection, Dimorphism, & Human Evolution - Addendum #1, Human Body Hair and Female Pattern 'Bareness'

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If loss of hair was an important variable in thermoregulation then we would expect {evolutionary pressure \ natural selection} to show a broad trend of hair thickness variations that could be correlated with the need to {retain\dissipate} heat.

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We do see this. From the same source, here discussing the need of larger bodies to {retain less \ dissipate more} heat due to the increase in volume as the cube but skin area as the square of a size dimension:

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To drive this point home, the number of hairs on the human body are precisely what they should be for the human body size. We are not displaced on the scale. There is no special loss of hair required for thermoregulation, and thus there is no special mechanism needed to provide for the loss of hair: no mutation is needed for the explanation of amount of human body hair. (1)

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What is different is that the hair does not mature beyond childhood (vellus) hair for almost all females and major portions of males. Mature (terminal) hair grows on the head, pubic and armpit areas on both sexes and on the face, chest, back and arms on males.What we see is that that female skin areas are covered with vellus hair, rather than terminal hair. Male pre-pubescent youth skin areas are also covered with vellus hair, rather than terminal hair.Sexual dimorphism points towards sexual selection being a factor.Retention of youthful characteristics into adulthood (neoteny) is well marked in human evolution, in facial characteristics (especially jaw and teeth) compared to other apes and in the long time it takes for humans to reach maturity after becoming sexually able.This is either another example of neoteny in humans or it is the raison d'etre for neoteny (ie sexual selection for younger appearing females).Enjoy.

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So sweating explains bare appearance in humans how?This concept of hair - sweat is a tie over from the old "savanna" theory of human bipedalism. Now that we know that bipedalism evolved before the savanna ecology this theory has been discredited.Now go back and rethink the bareness issue.Enjoy.

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The difference here is the human brain not the fur\bareness. Delayed gratification. The cheetah is the ultimate get-it-now-or-give-up approach, one you will see in many other animals. What makes humans, wolf packs and similar hunting behavior different is backing down from all out running and being able to track the prey. You can walk a deer down. Which again points to the women being the runners then. Half the hair of men.The fact that there is sexual dimorphism in human hairiness shows you where it is being selected - in the sex with the more pronounced expression of the trait.Next look at a few porn websites for unnaturally hairy women, naturally hairy women and unnaturally bare women. Look at ads. Look at the ever hair growing market for hair removal products and tell me that there is not ongoing sexual selection for bare appearing women. Why does googling "hairy women" produce websites of naturally hairy women versus ones with unnaturally shaved arms, legs, etc.?And this has nothing to do with why we are bare. What you may be looking at is the fact that the pre-adaptation for bareness while still in the forest-jungle ecology allowed this ability to develop and not the other way around.Running does not explain sexual dimorphism. Sex does.Sex made us human.Enjoy.

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It's called cursorial hunting:

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The hunters will pursue at a relatively measured pace a targeted quarry which in response will make short but high energy sprints to escape. Eventually the relentless pursuit will exhaust the quarry allowing it to be brought down by its pursuers.

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Wolves, hyenas, lungless spiders and humans are all animals that are well adapted to using this hunting strategy.

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None of which needed to evolve bareness to hunt in this manner.Enjoy.

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Or the breeding advantage of apparent bareness ... to the point where it threatened survival and clothes had to be invented for it to continue ...Enjoy.

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It isn't. It is selected in women, males just inherit it. Look at the variation in males versus women.Women - nearly all similarly bare, a disease with "male pattern hair" is a dreadful thing requiring treatment, just having a "mustache" is undesirable, trait heavily selected.Men - from nearly bare to covered in hair, all having little trouble finding mates, trait not selected at all.Enjoy.

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