Answer:
I am the signature stroll of ducks and penguins
At night I come without being fetched, and by day I am lost without being stolen. What am I?
What loses its head in the morning but gets it back at night?
Part carbon, part water, I am poison to the fishes. Many falsely claim my name, I am the pause that refreshes. What am I?
I am a precious stone as clear as diamond. Seek me out while the sun's near the horizon. Though you can walk on water with my power try to keep me and I'll vanish in an hour.
When is it bad luck to see a black cat?