Answer:
What goes through the door without pinching itself? What sits on the stove without burning itself? What sits on the table and is not ashamed?
This thing all things devours: Birds, beasts, trees, flowers; Gnaws iron, bites steel; Grinds hard stones to meal; Slays king, ruins town, And beats high mountains down.
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.
Hold the tail, while I fish for you.
Power enough to smash ships and crush roofs. Yet it still must fear the sun.
People take me on walks and I run and have fun. What am I?