I have always wondered why animals use terrestrial locomotion?  Why don't they just disappear and then reappear wherever they want to be?
It is definitely an interesting topic! I believe the way the body is supported by the legs is an important part. 
Yes, my appendages are certainly helpful in giving me an upright posture.  However slime molds also move, and they don't have legs.  They must be teleporting, right?
I find it interesting that certain animals have different posture's depending on the situation
Yes, i agree. I have two legs, so i understand my method of locomotion.  But what about the Springtail, which hurls itself where it wants to go by using it's tail like Furcula?
I have never heard of Furcula. Do you have more information on that?
Not right now, but that's all the hard questions.  I also like the praying mantis: it has four legs, two forearms, aqnd wings.  How's that for a multi modal system of terrestrial locomotion?
The praying Mantis is one of my favorites as well. There bulging eyes always freak me out