The giant Pacific octopus has developed many adaptations in order for it to survive in its environment. Some of the more interesting adaptations are described below. The two rear-most arms function as "legs." They are used to push off of the ocean floor, anchor itself in one place, and crawl over rocks and debris. The other six arms are used to grab objects, feel around, and feed the octopus. Every arm contains both radial and longitudinal muscles.