Answer:
A reaction to being spooked that takes its name from waterfowl
Fatherless and motherless. Born without sin, roared when it came into the world. And never spoke again.
I march before armies, a thousand salute me. My fall can bring victory, but no one would shoot me. The wind is my lover, one-Βlegged am I. Name me and see me at home in the sky.
What zips through the sky with a tail of fire and dust. It could be an omen, its origin to discuss?
I can be written, I can be spoken, I can be exposed, I can be broken.
Iβm grown from darkness but shine with a pale light. Very round I am and always a lady's delight.