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Junior Member (Idle past 5871 days) Posts: 12 From: Schererville, IN Joined: |
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Author | Topic: why is the lack of "fur" positive Progression for humans? | |||||||||||||||||||||||
RAZD Member (Idle past 1435 days) Posts: 20714 From: the other end of the sidewalk Joined: |
We're runners. One hunting strategy is to chase the animal until it collapses. We can run over long distances whereas animals with fur coats overheat and drop from heat exhaustion. 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 see someone out jogging with their dog? The jogger sweats over the entire surface of his body and is thus able to throw off excess body heat over the entire surface of his body. The dog can only throw off excess body heat through his tongue and the pads on his feet. If the jogger isn't careful, he could easily run his best friend to death, especially on a hot day. 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 we are limited in our ability to understand by our ability to understand RebelAAmericanOZen[Deist ... to learn ... to think ... to live ... to laugh ... to share.
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RAZD Member (Idle past 1435 days) Posts: 20714 From: the other end of the sidewalk Joined: |
This process was probably propelled by increases in body size and activity levels associated with modern limb proportions and striding bipedalism. 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.
This process was probably propelled by increases in body size and activity levels associated with modern limb proportions and striding bipedalism. 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. we are limited in our ability to understand by our ability to understand RebelAAmericanOZen[Deist ... to learn ... to think ... to live ... to laugh ... to share.
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RAZD Member (Idle past 1435 days) Posts: 20714 From: the other end of the sidewalk Joined: |
... what did we gain from the loss of fur that allowed the less hairy ancestors more able to survive. 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' quote: 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. we are limited in our ability to understand by our ability to understand RebelAAmericanOZen[Deist ... to learn ... to think ... to live ... to laugh ... to share.
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RAZD Member (Idle past 1435 days) Posts: 20714 From: the other end of the sidewalk Joined: |
Of course, horses sweat over their entire bodies. 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. we are limited in our ability to understand by our ability to understand RebelAAmericanOZen[Deist ... to learn ... to think ... to live ... to laugh ... to share.
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RAZD Member (Idle past 1435 days) Posts: 20714 From: the other end of the sidewalk Joined: |
Not faster, but farther. Take for example, the cheetah, which is the fastest land animal. In a 100-yard dash, it would beat us hands ... er ... paws-down. But who would win a 1-mile run? 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.
Remember also that the excess body heat I'm talking about is generated by the act of running. Not just from walking about in the noon-day sun, but from running. 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. we are limited in our ability to understand by our ability to understand RebelAAmericanOZen[Deist ... to learn ... to think ... to live ... to laugh ... to share.
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RAZD Member (Idle past 1435 days) Posts: 20714 From: the other end of the sidewalk Joined: |
Ever see a wolf Pack hunting? Deer running? It's called cursorial hunting:
quote: None of which needed to evolve bareness to hunt in this manner. Enjoy. we are limited in our ability to understand by our ability to understand RebelAAmericanOZen[Deist ... to learn ... to think ... to live ... to laugh ... to share.
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RAZD Member (Idle past 1435 days) Posts: 20714 From: the other end of the sidewalk Joined: |
But we are talking about survival advantage and fur. 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. we are limited in our ability to understand by our ability to understand RebelAAmericanOZen[Deist ... to learn ... to think ... to live ... to laugh ... to share.
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RAZD Member (Idle past 1435 days) Posts: 20714 From: the other end of the sidewalk Joined: |
Another author points out that it is unusual in sexual selection to have the same trait selected for in both sexes. 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. we are limited in our ability to understand by our ability to understand RebelAAmericanOZen[Deist ... to learn ... to think ... to live ... to laugh ... to share.
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