It then brakes the crab's shell apart and after eating the body, neatly eats the legs, pulling one off at a time. An octopus has many defenses against its predators of bass and rockfishes. It can swim quickly using a powerful siphon that shoots water behind it, or squirt a cloud of ink around it, making it hard to see. They can change color in various ways to blend in with their surroundings. Most predators will avoid their rough tentacles and sharp beaks after their first tangle.
Many large whales bear deep scars from the tentacles of big octopuses.
If you find an octopus in a tide pool, you need to be careful with it. They can also spit poisonous juices at you.