Answer:
The sharp slim blade, that cuts the wind. What is it?
Only two backbones and thousands of ribs.
The eight of us move forth and back. To protect our king from the foes attack.
who do you think you know but sometimes you don't
Only one color, but not one size. Stuck at the bottom, yet easily flies. Present in sun, but not in rain. Doing no harm, and feeling no pain.
When is it bad luck to see a black cat?