Answer:
Only one color, but not one size. Stuck at the bottom, yet easily flies. Present in sun, but not in rain; doing no harm, and feeling no pain. What am I?
I am the signature stroll of ducks and penguins
Lighter than what I am made of. More of me is hidden than seen. What am I?
Never ahead, ever behind, yet flying swiftly past, for a child, I last forever, for adults, I'm gone too fast.
Cold head and feet; round as a ball; always turning around myself.
What language does a billboard speak?