Why are human beings walking on feet?

The reason we evolved to walk upright was so that men could bring food back to the home. They were able to go search for food long distances away. This allowed women to stay close to the home and raise kids, which meant the children were safe…

We walk on our feet because our hands are used for other tasks…unlike dogs, we can actually walk and juggle at the same time!

born2bastar, you are a little confused. Instances of children learning their behaviors from animals and walking on all fours does not erase the fact that our skeletal structure is not designed to allow us to comfortably walk on all fours. You’re taking a few isolated instances where people are ABLE to do something and using it to establish a norm, which does not hold up. It’s like saying double amputees who are able to use their feet effectively as hands proves that feet are better at holding things than hands.

There’s always a tradeoff. Trading two legs for arms means a loss of speed, and running is far less efficient. There’s no way we’re going to chase down any animal with four legs, turtles not included, but I’d say freeing up those hands for tool-making is a pretty good deal. Large brains mean more reasoning ability, but it also takes much more food per day to keep them running. Forward-facing eyes means depth perception, but vulnerability to attack from the sides and rear.

All in all, we’re far from a perfect design, but I think we made out pretty well. Is it practical to have two arms instead of four legs? Depends on what you plan on using them for.

if we adapted from living in forests to walking the plains then exposing 10% of our skin to direct sun on two legs instead of 60% on four legs is really in our best interest. not to mention we grow thick hair on that 10% of our skin~