Answer:
Long and slinky like a trout, never sings till it's guts come out.
What is that over the head and under the hat?
I appear in the morning. But am always there. You can never see me. Though I am everywhere. By night I am gone, though I sometimes never was. Nothing can defeat me. But I am easily gone.
Who eats a lot of iron without getting sick?
My life can be measured in hours, I serve by being devoured. Thin, I am quick. Fat, I am slow. Wind is my foe.
What language does a billboard speak?