Answer:
A pony trots his way through the world on these.
Tall when seated, short when standing.
For our ambrosia we were blessed, By Jupiter, with a sting of death. Though our might, to some is jest, We have quelled the dragon's breath. Who are we?
In the fields a frightful thing. Watch it and you will find, it has a pitchfork in the front, and a broom back behind.
A house has 4 walls. All of the walls are facing south, and a bear is circling the house. What color is the bear?
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.