Answer:
I make a living following the wealthy and beautiful.
My teeth are sharp my back is straight to cut things up it is my fate.
What has a head and a tail but no body?
First you see me in the grass dressed in yellow gay; next I am in dainty white, then I fly away. What am I?
I shift around though always slowly. I never move more than a few inches at a time. A large movement by me can kill many people. I am huge yet unseen by humans.
Give it food and it will live, give it water and it will die.