Answer:
I save lives on the ground and in the air
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?
By Moon or by Sun, I shall be found. Yet, if there's no light around, I am undone. What am I?
First you see me in the grass dressed in yellow gay; next I am in dainty white, then I fly away. What am I?
Without a bridle or a saddle across a thing I ride a-straddle. And those I ride by help of me though almost blind are made to see.
I am a animal that is cute but dangerous, what am I?