Answer:
What flies without wings?
I am a protector. I sit on a bridge. One person can see right through me, while others wonder what I hide. What am I?
I walk on 4 legs in the morning, 2 legs at noon, and 3 legs at night. What am I?
Although a human shape I wear, mother I never had. By every miss I'm valued much, still my cruel fate is such by boys I am often despised. What am I?
Although a human shape I wear Mother I never had; And though no sense nor life I share in finest silks I'm clad. By every miss I'm valued much beloved and highly prized; still my cruel fate is such by boys I am often despised.
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.