Answer:
You seek me out when your hunger's ripe. I sit on four legs and smoke a pipe.
I can be long or short. I can be grown or bought. I can be painted or left bare. My tip can be round or square. (one word)
I am commonly abbreviated to H
I pass before the sun, yet make no shadow. I'm all around you, but you cannot see me. What am I?
I was not born but I am here. I have no name but I am given many. I was made by science and life
I break away from my pack. I create holes in my victims. I can travel for miles and then disappear. I am part of a dying breed. What am I?