Answer:
Up on high I wave away but not a word can I say.
Do you know what you can hold without ever touching it?
A leathery snake, with a stinging bite. I'll stay coiled up, unless I must fight.
There is an ancient invention. Still used in some parts of the world today. That allows people to see through walls.
When set loose I fly away. Never so cursed as when I go astray.
People take me on walks and I run and have fun. What am I?