Answer:
You use a knife to slice my head. And weep beside me when I am dead.
A serpent swam in a silver urn, A golden bird did in its mouth abide, The serpent drank the water, this in turn, Killed the serpent. Then the gold bird died.
You eat something you neither plant nor plow. It is the son of water, but if water touches it, it dies.
With pointed fangs it sits in wait. With piercing force it doles out fate, over bloodless victims proclaiming its might. Eternally joining in a single bite.
My head bobs lazily in the sun. You think I'm cute. For my face is yellow my hair is white and my body is green.
What never gets any wetter no matter how hard it rains?