Answer:
I run up and down the stairs without moving
Santa shakes his belly like a bowl full of me
I build bridges of silver and crowns of gold. What am I?
I am owned by Old McDonald.
I'm where yesterday follows today and tomorrow is in the middle. What am I?
I break away from my pack. I create holes in my victims. I can travel for miles and then disappear. I am part of a dying breed. What am I?