Answer:
A house of wood in a hidden place. Built without nails or glue. High above the earthen ground. It holds pale gems of blue.
I sleep by day, I fly by night. I have no feathers to aid my flight.
I'm not really more than holes tied to more holes. I'm strong as good steel, though not as stiff as a pole.
What has four legs during the day; and six or eight during the night?
I dig out tiny caves and store gold and silver in them. I also build bridges of silver and make crowns of gold. They are the smallest you could imagine. Sooner or later everybody needs my help. Yet many people are afraid to let me help them.
This food is a tortilla filled with cheese and sometimes chicken before being heated or cooked.