Answer:
If I have it, I don't share it. If I share it, I don't have it. What is it?
What has two legs but doesn't walk?
There is an ancient invention. Still used in some parts of the world today. That allows people to see through walls.
Though easy to spot, when allowed to plume, It is hard to see, when held in a room.
Just head and foot yet never tires of dancing.
All about, but cannot be seen, Can be captured, cannot be held, No throat, but can be heard. Who am I?