Answer:
A spent round or a slimy critter.
I have eight to spare and am covered with hair.
Often cooked as fillet, this meat comes from an animal that swims underwater.
I am the only animal to have the same Latin and common name.
I live in the ocean but I am not a fish. I have eight arms and can change colors quickly. What am I?
They are many and one, they wave and they drum, Used to cover a state, they go with you everywhere.