Answer:
Reaching stiffly for the sky, I bare my fingers when its cold. In warmth I wear an emerald glove and in between I dress in gold.
They try to beat me, they try in vain. And when I win, I end the pain.
I have four legs but no tail. Usually I am heard only at night.
What's as small as a mouse but guards a house like a lion?
I'm light as a feather, yet the strongest man can't hold me for more than 5 minutes.
What did the piece of wood say when he saw the screwdriver and screws approaching?