Answer:
They are Dark, and always on the run. without the sun, would be none!
Rotten trees and Jack-O-Lanterns have this characteristic in common.
What can be measured but has no length, width or height?
White and thin, red within, with a nail at the end. What is it?
A blue man lives in the blue house. A red man lives in the red house. Who lives in the white house?
It flows out of the soil, It burns you if it boils, And holds us in its coils, More valuable than gold, As black as it is old.