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Why did our ancestors start walking upright?

bipedal geology australopithecus

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#31    Frank Merton

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Posted 26 May 2013 - 06:35 AM

Gorillas and Chimpanzees, when on the ground, walk mainly on their knuckles, but are capable of carrying things reasonable distances.  They are still largely arboreal but do spend time on the ground.  Orangs and gibbons are entirely arboreal and move about mainly by brachiating -- as do monkeys -- or by walking along branches, using their hands for balance or support.  All of this requires an opposable thumb and grasping fingers with prints and nails -- all inherited from monkeys, who evolved the traits in the first place.

Pre-evolution happens a lot -- it is when a creature gets features that by good luck adapt it to a new environment.  Humans were, then, pre-evolved for walking upright and carrying things by our predecessors who lived in trees.  Assuming some humanoids found themselves in a non-forest environment (maybe grassland, maybe, per the OP, rocky terrain), but they were adapted to tree living.  They can't change back into four-footed animals, so they do something else that they are luckily pre-adapted for -- they evolve bipedalism.  Evolution is not planned -- it has to take advantage of the situation as it exists "on the ground," as it were.


#32    Arbenol

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Posted 26 May 2013 - 06:47 AM

View PostGirlfromOz, on 25 May 2013 - 01:16 PM, said:

If Man evolved from the apes,then,why are there still man & apes?!

If my cousin and I are descended from my grandfather, then why is there still me, my cousin and my grandfather.

Explain that!


#33    Arbenol

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Posted 26 May 2013 - 06:52 AM

Obviously, any species that can walk and scratch it's backside at the same time is going to have a significant evolutionary advantage.

Bears have to find a tree. That's why polar bears are always so grumpy.


#34    Frank Merton

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Posted 26 May 2013 - 07:03 AM

That's why I was so frustrated when the airlines declared that I can't take my backscratcher with my carry-on baggage.


#35    Arbenol

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Posted 26 May 2013 - 07:14 AM

View PostFrank Merton, on 26 May 2013 - 07:03 AM, said:

That's why I was so frustrated when the airlines declared that I can't take my backscratcher with my carry-on baggage.

Maybe you could take a small tree next time.


#36    lightly

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Posted 26 May 2013 - 11:41 AM

View PostPersonFromPorlock, on 26 May 2013 - 12:15 AM, said:

Well, the only other apes with a bipedal (more or less) habit, bonobos, live in jungles and split their time between trees and ground, so I kinda doubt that 'leaving the jungle' was essential to human bipedalism. Probably the first upright hominim who was bright enough to realize that carrying a club in his free hand gave him an enormous advantage over the competition was the father of us all.

     this makes me wonder.. what was in his other hand?     My guess is the reasons  were multiple..   carrying things and being able to  see farther for self defense and food  gathering?

Important:  The above may contain errors, inaccuracies, omissions, and other limitations.

#37    Maz1

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Posted 26 May 2013 - 09:10 PM

There was a documentary 10 years ago which said that one of the reason we are bipedal is to conserve our energy for sex.

*Goes back to my little hole*


#38    bigjonalien

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Posted 26 May 2013 - 11:06 PM

I'd like  to know why we weren't born with four arms and two hearts?


#39    DieChecker

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Posted 26 May 2013 - 11:06 PM

Gorillas and Chimps walk tripod when carrying or dragging something. Those apes mostly have one baby at a time. Now imagine a sub-species of chimp that had two or more babies at a time... They'd need both hands to carry their babies.

Posted Image
Posted Image

Edited by DieChecker, 26 May 2013 - 11:12 PM.

Here at Intel we make processors on 12 inch wafers. And, the individual processors on the wafers are called die. And, I am employed to check these die. That is why I am the DieChecker.

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#40    Skithia

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Posted 27 May 2013 - 10:38 AM

View PostGirlfromOz, on 25 May 2013 - 03:57 PM, said:

I am not going to waste my time trying to explain to yourselves.Your dual identities explain it all.Your explanations are not sufficient enough to me to warrant my explaining myself to you.Just get on with it all & accept the whole biblical truth.

Why?


#41    Abramelin

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Posted 27 May 2013 - 03:21 PM

Why did our ancestors start walking upright?

Maybe their knees started hurting:

Posted Image


#42    Frank Merton

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Posted 27 May 2013 - 03:27 PM

From the picture it is obvious we are not designed to walk on all fours.  The thing is, we are descended from animals that were.  Hence morning backache.


#43    PersonFromPorlock

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Posted 27 May 2013 - 03:55 PM

View Postlightly, on 26 May 2013 - 11:41 AM, said:

this makes me wonder.. what was in his other hand?

Paperwork. It started early.


#44    starchild1976

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Posted 30 May 2013 - 06:39 AM

It was to help the chicken  cross the road.


#45    Artaxerxes

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Posted 07 August 2013 - 03:37 AM

It takes less energy to walk bi-pedal on two legs than it does on four legs.  It's as simple as that.  Food/energy/calories were at a premium and our ancestors had to save energy any way they could.  They had to go further to feed and it was cheaper energy wise to walk on two legs than on four.






Also tagged with bipedal, geology, australopithecus

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