Answer:
The signature stroll of ducks and penguins.
What can provide food before it is alive, while it is alive and after it's dead?
A spent round or a slimy critter.
I'm a red creature from the sea with large claws, or pincers, and I'm often boiled and served as an expensive dish at seafood restaurants.
With four oars it swims but it is always at home. Its back is like armor, tougher than chrome. What is it?
A leathery snake, with a stinging bite. I'll stay coiled up, unless I must fight.